Preston, R. J. (1948). North American trees (exclusive of Mexico and tropical United States) A handbook designed for field use, with plates and distribution maps. The Iowa State College 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. Ames, Iowa: The Iowa State College Press, 1948.
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. The Iowa State College Press, 1948.
Warning: These citations may not always be 100% accurate.