Gaya APA

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

Gaya MLA

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