Cogbill, Charles V., Peter S. White, and Susan K. Wiser. "Predicting Treeline Elevation in the Southern Appalachians." Castanea 62, no. 3 (1997): 137-146.

White, Peter S., and Charles V. Cogbill. "Spruce-fir Forests of Eastern North America." In Ecology and Decline of Red Spruce in the Eastern United States, 3-39. Vol. 96. New York, NY: Springer-Verlag, 1992.

Cogbill, Charles V., and Peter S. White. "The Latitude-Elevation Relationship for Spruce-Fir Forest and Treeline along the Appalachian Mountain Chain." Vegetatio 94, no. 2 (1991): 153-175.