APA (7th ed.) Citation

Merrill, G. P. (1969). The first one hundred years of American geology. Hafner.

Chicago Style (17th ed.) Citation

Merrill, George P. The First One Hundred Years of American Geology. New York: Hafner, 1969.

MLA (9th ed.) Citation

Merrill, George P. The First One Hundred Years of American Geology. Hafner, 1969.