Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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