Gaya APA

Simpson, G, G., S, I, B, W. (1965). Life an introduction to biology . New York: New York: Harcourt, Brace & World; 1965.

Gaya MLA

Simpson, George, Gaylord., S, I., Beck,, William. "Life an introduction to biology". New York: New York: Harcourt, Brace & World; 1965, 1965. Text.