Cita APA (7th ed.)

American Geological Institute. (1972). Investigating the earth. Houghton Mifflin.

Cita Chicago (17th ed.)

American Geological Institute. Investigating the Earth. New York: Houghton Mifflin, 1972.

Cita MLA (9th ed.)

American Geological Institute. Investigating the Earth. Houghton Mifflin, 1972.