APA (7e ed.) Bronvermelding

Não informado. (1969). Yearbook of international congress proceedings. Union of International Associations.

Chicago (17e ed.) Bronvermelding

Não informado. Yearbook of International Congress Proceedings. Brussels: Union of International Associations, 1969.

MLA (8e ed.) Bronvermelding

Não informado. Yearbook of International Congress Proceedings. Union of International Associations, 1969.

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