Cita APA (7th ed.)

Barton, M. (2001). The international wildlife encyclopedia Vol 1 to Vol 21. Marshall Cavendish corporation.

Cita Chicago (17th ed.)

Barton, Maurice. The International Wildlife Encyclopedia Vol 1 to Vol 21. New York: Marshall Cavendish corporation, 2001.

Cita MLA (9th ed.)

Barton, Maurice. The International Wildlife Encyclopedia Vol 1 to Vol 21. Marshall Cavendish corporation, 2001.