Gaya APA

Swanson, C, P., Garrels, R, M. (1951). A textbook of geology . New York: New York: Harper & Brothers; 1951.

Gaya MLA

Swanson, Carl, P.., Garrels, Robert, M. "A textbook of geology". New York: New York: Harper & Brothers; 1951, 1951. Text.