Gaya APA

Kusumastuti, H., Muller, T, M, O, A. (1982). Essentials of physical geography today . New York: Random Haouse.

Gaya MLA

Kusumastuti, Harini., Muller, Theodore, M., OberlanderRobert, A.. "Essentials of physical geography today". New York: Random Haouse, 1982. Text.