Burton, M. B. (1969). The International wild life encyclopedia. Marshall Cavendish.
Cita Chicago (17th ed.)Burton, Maurice Burton. The International Wild Life Encyclopedia. New York: Marshall Cavendish, 1969.
Cita MLA (9th ed.)Burton, Maurice Burton. The International Wild Life Encyclopedia. Marshall Cavendish, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.