Gaya APA

Muller, R, A., Oberlander, T, M. (1978). Physical geography today : a portrait of a planet (2nd ed). New York: Random House.

Gaya MLA

Muller, Robert, A.., Oberlander, Theodore, M.. "Physical geography today : a portrait of a planet". 2nd ed New York: Random House, 1978. Text.