Gaya APA

Marsland, D., Swanson, C, P. (NULL). Principles of modern biology . New: New York: Holt, Rinehart and Winston; 1964.

Gaya MLA

Marsland, Douglas., Swanson, Carl, P.. "Principles of modern biology". New: New York: Holt, Rinehart and Winston; 1964, NULL. Text.