Gaya APA

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

Gaya MLA

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