Dyfyniad APA

Muller, R. A., Kolenkow, R. J., & Oberlander, T. (1978). Physical geography today: A portrait of a planet (2nd ed.). CRM/Random House.

Dyfyniad Arddull Chicago

Muller, Robert A., Robert J. Kolenkow, and Theodore Oberlander. Physical Geography Today: A Portrait of a Planet. 2nd ed. New York: CRM/Random House, 1978.

Dyfyniad MLA

Muller, Robert A., et al. Physical Geography Today: A Portrait of a Planet. 2nd ed. CRM/Random House, 1978.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.