APA (7e ed.) Bronvermelding

Não informado. (1977). Perception. Canadian Council on Social Development.

Chicago (17e ed.) Bronvermelding

Não informado. Perception. Ottawa: Canadian Council on Social Development, 1977.

MLA (8e ed.) Bronvermelding

Não informado. Perception. Canadian Council on Social Development, 1977.

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