Não informado. (1959). International Zoo Yearbook. Zoological Society of London.
Style de citation Chicago (17e éd.)Não informado. International Zoo Yearbook. London: Zoological Society of London, 1959.
Style de citation MLA (8e éd.)Não informado. International Zoo Yearbook. Zoological Society of London, 1959.
Attention : ces citations peuvent ne pas être correctes à 100%.