Preston, R. J. (1976). North American trees (exclusive of Mexico and tropical United States): A handbook designed for field use, with plates and distribution maps (3d ed.). Iowa State University Press.
Chicago Style (17th ed.) CitationPreston, Richard J. North American Trees (exclusive of Mexico and Tropical United States): A Handbook Designed for Field Use, with Plates and Distribution Maps. 3d ed. Ames: Iowa State University Press, 1976.
MLA (9th ed.) CitationPreston, Richard J. North American Trees (exclusive of Mexico and Tropical United States): A Handbook Designed for Field Use, with Plates and Distribution Maps. 3d ed. Iowa State University Press, 1976.
Warning: These citations may not always be 100% accurate.