Cita APA (7a ed.)

Harper, R. A., & Stoltman, J. P. (1984). World geography. Steck-Vaughn.

Cita Chicago Style (17a ed.)

Harper, Robert A., y Joseph P. Stoltman. World Geography. Austin, Tex: Steck-Vaughn, 1984.

Cita MLA (9a ed.)

Harper, Robert A., y Joseph P. Stoltman. World Geography. Steck-Vaughn, 1984.