Cita APA (7th ed.)

Whipple, G., & James, P. E. (1954). Using our earth. McMillan.

Cita Chicago (17th ed.)

Whipple, Gertrude, i Preston E. James. Using Our Earth. Nueva York: McMillan, 1954.

Cita MLA (9th ed.)

Whipple, Gertrude, i Preston E. James. Using Our Earth. McMillan, 1954.