Gaya APA

Swanson, C, P., Pfeiffer, J, E. (1968). The search for early man . New York: New York: American Heritage; 1968.

Gaya MLA

Swanson, Carl, P.., Pfeiffer, John, E. "The search for early man". New York: New York: American Heritage; 1968, 1968. Text.