Meyer, P. W. 1., Briger, C. B., & Barnard, E. S. (2017). Philadelphia trees: A field guide to the city and the surrounding Delaware Valley. New York: Columbia University Press.

Meyer, Paul W. 1952-,, Catriona Bull Briger, and Edward Sibley Barnard. Philadelphia Trees: A Field Guide to the City and the Surrounding Delaware Valley. New York: Columbia University Press, 2017.

Meyer, Paul W. 1952-,, Catriona Bull Briger, and Edward Sibley Barnard. Philadelphia Trees: A Field Guide to the City and the Surrounding Delaware Valley. New York: Columbia University Press, 2017.