APA (7th ed.) Citation

Van Diver, B. B. (1993). Roadside geology of Pennsylvania (2. printing.). Mountain Press.

Chicago Style (17th ed.) Citation

Van Diver, Bradford B. Roadside Geology of Pennsylvania. 2. printing. Missoula, MT: Mountain Press, 1993.

MLA (9th ed.) Citation

Van Diver, Bradford B. Roadside Geology of Pennsylvania. 2. printing. Mountain Press, 1993.