Rose, Anita Kristine, and Niki Stephanie Nicholas. "Coarse Woody Debris in a Southern Appalachian Spruce-fir Forest of the Great Smoky Mountains National Park." Natural Areas Journal 28, no. 4 (2008): 342-355.

Moore, Patrick T., Helga Van Miegroet, and Niki Stephanie Nicholas. "Examination of Forest Recovery Scenarios in a Southern Appalachian Picea ? Abies Forest." Forestry  81, no. 2 (2008): 183-194.

Van Miegroet, Helga, Patrick T. Moore, C. E. Tewksbury, and Niki Stephanie Nicholas. "Carbon Sources and Sinks in High-Elevation Spruce-fir Forests of the Southeastern US." Forest Ecology and Management 238, no. 1-3 (2007): 249-260.

Moore, Patrick T., Helga Van Miegroet, and Niki Stephanie Nicholas. "Relative Role of Understory and Overstory in Carbon and Nitrogen Cycling in a Southern Appalachian Spruce-Fir Forest."  Canadian Journal of Forest Research 37, no. 12 (2007): 2689-2700.

Mancusi, Michael R., and Niki Stephanie Nicholas. Changes in the Great Smoky Mountains Fraser Fir Forest (1990-2000) In Report to the Great Smoky Mountains National Park. Knoxville, TN: University of Tennessee, 2004.

Creed, Irena F., D. L. Morrison, and Niki Stephanie Nicholas. "Is Coarse Woody Debris a Net Sink or Source of Nitrogen in the Red Spruce - Fraser Fir Forest of the Southern Appalachians, USA?" Canadian Journal of Forest Research 34, no. 3 (2004): 716-727.

Webster, K. L., Irena F. Creed, Niki Stephanie Nicholas, and Helga Van Miegroet. "Exploring Interactions Between Pollutant Emissions and Climatic Variability in Growth of Red Spruce in the Great Smoky Mountains National Park." Water Air and Soil Pollution 159, no. 1 (2004): 225-248.

Barker, M., Helga Van Miegroet, Niki Stephanie Nicholas, and Irena F. Creed. "Variation in Overstory Nitrogen Uptake in a Small, High-Elevation Southern Appalachian Spruce-Fir Watershed." Canadian Journal of Forest Research 32, no. 10 (2002): 1741-1752.

Van Miegroet, Helga, Irena F. Creed, Niki Stephanie Nicholas, D. G. Tarboton, K. L. Webster, J. Shubzda, B. Robinson, James L. Smoot, Dale W. Johnson, Steven E. Lindberg et al. "Is There Synchronicity in Nitrogen Input and Output Fluxes at the Noland Divide Watershed, a Small N-Saturated Forested Catchment in the Great Smoky Mountains National Park." The Scientific World Journal 1 (2001): 480-492.

Smith, George F., and Niki Stephanie Nicholas. "Size- and Age-Class Distributions of Fraser Fir Following Balsam Woolly Adelgid Infestation." Canadian Journal of Forest Research 30, no. 6 (2000): 948-957.

Smith, George F., and Niki Stephanie Nicholas. "Patterns of Overstory Composition in the FIr and Fir-Spruce Forests of the Great Smoky Mountains After Balsam Woolly Adelgid Infestation." The American Midland Naturalist 139, no. 2 (1998): 340-352.

Smith, George Francis. Southern Appalachian Fir and Fir-Spruce Forest Community Changes Following Balsam Woolly Adelgid Infestation In Ecology and Evolutionary Biology. Vol. Master of Science. Knoxville: University of Tennessee, 1997.

Pauley, Eric F., Stephen C. Nodvin, Niki Stephanie Nicholas, Anita Kristine Rose, and Thomas Bryan Coffey. "Vegetation, Biomass, and Nitrogen Pools in a Spruce-Fir Forest of the Great Smoky Mountains National Park." Bulletin of the Torrey Botanical Club 123, no. 4 (1996): 318-329.

Nodvin, Stephen C., Helga Van Miegroet, Steven E. Lindberg, Niki Stephanie Nicholas, and Dale W. Johnson. "Acidic Deposition, Ecosystem Processes, and Nitrogen Saturation in a High Elevation Southern Appalachian Watershed." Water Air and Soil Pollution 85, no. 3 (1995): 1647-1652.

Smith, George F., and Niki Stephanie Nicholas. Regeneration of Fraser Fir After Thirty Years of Balsam Woolly Adelgid Infestation. Great Smoky Mountains National Park, 1995.

Reams, Gregory A., Niki Stephanie Nicholas, and Shephard M. Zedaker. "Two Hundred Year Variation of Southern Red Spruce Radial Growth as Estimated by Spectral Analysis." Canadian Journal of Forest Research 23 (1993): 291-301.

Nicholas, Niki Stephanie, Shephard M. Zedaker, and Christopher C. Eagar. "A Comparison of Overstory Community Structure in Three Southern Appalachian Spruce-Fir Forests." Bulletin of the Torrey Botanical Club 119, no. 3 (1992): 316-332.

Peart, David R., Niki Stephanie Nicholas, Shephard M. Zedaker, Margaret M. Miller-Weeks, and Thomas G. Siccama. "Condition and Recent Trends in High-Elevation Red Spruce Populations." In Ecology and Decline of Red Spruce in the Eastern United States, 125-191. Vol. 96. New York, NY: Springer-Verlag, 1992.

Nicholas, Niki Stephanie, and Shephard M. Zedaker. "Expected Stand Behavior: Site Quality Estimation for Southern Appalachian Red Spruce." Forest Ecology and Management 47, no. 1 (1992): 39-50.

Leblanc, David C., Niki Stephanie Nicholas, and Shephard M. Zedaker. "Prevalence of Individual-Tree Growth Decline in Red Spruce Populations of Southern Appalachian Mountains." Canadian Journal of Forest Research 22, no. 6 (1992): 905-914.

Nicholas, Niki Stephanie, Shephard M. Zedaker, Christopher C. Eagar, and F. T. Bonner. "Seedling Recruitment and Stand Regeneration in Spruce-Fir Forests of the Great Smoky Mountains." Bulletin of the Torrey Botanical Club 119, no. 3 (1992): 289-299.

Nicholas, Niki Stephanie, T. G. Gregoire, and Shephard M. Zedaker. "The Reliability of Tree Crown Position." Canadian Journal of Forest Research 21, no. 5 (1991): 689-701.

Nicholas, Niki Stephanie, and Shephard M. Zedaker. Forest Decline and Regeneration Success of the Great Smoky Mountains Spruce-Fir In First Annual Southern Appalachian Man and the Biosphere Conference. Gatlinburg, TN: Tennessee Valley Authority, 1990.

Zedaker, Shephard M., Niki Stephanie Nicholas, and Christopher C. Eagar. "Assessment of Forest Decline in the Southern Appalachian Spruce-Fir Forest, USA." In Air Pollution and Forest Decline: Proceedings of the 14th International Meeting for Specialists in Air Pollution Effects on Forest Ecosystems, International Union of Forest Research O, 239-44. Birmensdorf, Switzerland: Eidgenössische Anstalt für das forstliche Versuchswesen, 1989.

Zedaker, Shephard M., and Niki Stephanie Nicholas. Albany II: An Update on Southern Appalachian Spruce-Fir Site and Stand Characteristics In The Second Workshop on Integration of Red Spruce Biological Data with Atmospheric Data. Albany, NY: Department of Forestry, Virginia Polytechnic Institute and State University, 1988.

Zedaker, Shephard M., Niki Stephanie Nicholas, Christopher C. Eagar, Peter S. White, and Thomas E. Burk. Stand Characteristics Associated with Potential Decline of Spruce-Fir Forests in the Southern Appalachians In Proceedings of the US/FRG Research Symposium: Effects of Atmospheric Pollutants on the Spruce-Fir Forests of the Eastern United States and the Federal Republic of Germany. Burlington, VT: U.S.D.A. Forest Service, 1988.

White, Peter S., Dean Berg, Mark E. Harmon, and Niki Stephanie Nicholas. Fire History and Management in Great Smoky Mountains National Park, An Update In Conference on Science in the National Parks. WR 208 ed. Vol. 4. George Wright Society, 1986.

Nicholas, Niki Stephanie, and Peter S. White. The Effect of Balsam Woolly Aphid Infestation on Fuel Levels in Spruce-Fir Forests of Great Smoky Mountains National Park. National Park Service -- Southeast Region, 1985.

Nicholas, Niki Stephanie, and Peter S. White. The Effect of the Southern Pine Beetle on Fuel Loading in Yellow Pine Forests of Great Smoky Mountains National Park In Research/Resources Management Report. Gatlinburg, TN: U.S. Department of the Interior, National Park Service, 1984.

Nicholas, Niki Stephanie. Fuel Levels in Forests of the Great Smoky Mountains National Park. Knoxville, TN: University of Tennessee, 1984.

Nicholas, Niki Stephanie, and Peter S. White. Great Smoky Mountains National Park Hard Mast Survey:  An Evaluation of the Current Survey, Analysis of Past Data, and Discussion of Alternatives for Future Surveys. Gatlinburg, TN: Uplands Field Research Laboratory, 1984.