Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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