Não informado. (1959). International Zoo Yearbook. Zoological Society of London.
Chicagoスタイル(17版)引用形式Não informado. International Zoo Yearbook. London: Zoological Society of London, 1959.
MLA(8版)引用形式Não informado. International Zoo Yearbook. Zoological Society of London, 1959.
警告: この引用は必ずしも正確ではありません.