Maple. (2013). Zoo Animal Welfare (1.). Springer Berlin Heidelberg.
Cita Chicago (17th ed.)Maple. Zoo Animal Welfare. 1. Springer Berlin Heidelberg, 2013.
Cita MLA (8th ed.)Maple. Zoo Animal Welfare. 1. Springer Berlin Heidelberg, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.