Cita APA (7a ed.)

Oberlander, T. M., & Muller, R. A. (1987). Essentials of physical geography today (2nd ed.). Random House.

Cita Chicago Style (17a ed.)

Oberlander, Theodore M., y Robert A. Muller. Essentials of Physical Geography Today. 2nd ed. New York: Random House, 1987.

Cita MLA (9a ed.)

Oberlander, Theodore M., y Robert A. Muller. Essentials of Physical Geography Today. 2nd ed. Random House, 1987.