Oberlander, T. M., & Muller, R. A. (1987). Essentials of physical geography today (2nd ed.). Random House.
Chicago-čujuhus (17. p.)Oberlander, Theodore M., juo Robert A. Muller. Essentials of Physical Geography Today. 2nd ed. New York: Random House, 1987.
MLA-čujuhus (9. p.)Oberlander, Theodore M., juo Robert A. Muller. Essentials of Physical Geography Today. 2nd ed. Random House, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.