APA (7th ed.) Citation

Hubbard, G. D. (1937). The geography of Europe. D. Appleton-Century.

Chicago Style (17th ed.) Citation

Hubbard, George David. The Geography of Europe. New York: D. Appleton-Century, 1937.

MLA (9th ed.) Citation

Hubbard, George David. The Geography of Europe. D. Appleton-Century, 1937.