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. 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: 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. Iowa State College Press, 1948.
Warning: These citations may not always be 100% accurate.