Gaya APA

Harper, R, A., Schmudde, T, H. (1978). Between two worlds : an introduction to geography (2nd ed). Boston: Houghton Mifflin.

Gaya MLA

Harper, Robert, A.., Schmudde, Theodore, H.. "Between two worlds : an introduction to geography". 2nd ed Boston: Houghton Mifflin, 1978. Text.