APA (7e ed.) Bronvermelding

Não informado. (2001). Annual Report of the Board of Directors of the Zoological Society of Philadelphia. Zoological Society of Philadelphia.

Chicago (17e ed.) Bronvermelding

Não informado. Annual Report of the Board of Directors of the Zoological Society of Philadelphia. Philadelphia, Pa: Zoological Society of Philadelphia, 2001.

MLA (8e ed.) Bronvermelding

Não informado. Annual Report of the Board of Directors of the Zoological Society of Philadelphia. Zoological Society of Philadelphia, 2001.

Let op: Deze citaties zijn niet altijd 100% accuraat.