APA (7e ed.) Bronvermelding

Não informado. (2003). Waterbirds. Waterbird Society.

Chicago (17e ed.) Bronvermelding

Não informado. Waterbirds. De Leon Springs, Fla: Waterbird Society, 2003.

MLA (8e ed.) Bronvermelding

Não informado. Waterbirds. Waterbird Society, 2003.

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