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.

Cook, Edward R., and Shephard M. Zedaker. "The Dendroecology of Red Spruce Decline." In Ecology and Decline of Red Spruce in the Eastern United States, 192-231. 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.