Gaya APA

Swanson, C, P., U, I, C, R. (1969). Trends in geography An introductory survey . London: London: Pergamon Press; 1969.

Gaya MLA

Swanson, Carl, P.., U, I., Cooke,, Ronald. "Trends in geography An introductory survey". London: London: Pergamon Press; 1969, 1969. Text.