Oberlander, T. M., & Muller, R. A. (1987). Essentials of physical geography today (2nd ed.). Random House.
Lua i Stíl Chicago (17ú heag.)Oberlander, Theodore M., agus Robert A. Muller. Essentials of Physical Geography Today. 2nd ed. New York: Random House, 1987.
Lua MLA (9ú heag.)Oberlander, Theodore M., agus Robert A. Muller. Essentials of Physical Geography Today. 2nd ed. Random House, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.