APA (7e ed.) Bronvermelding

Não informado. (1970). Directory. International Federation of Library Associations.

Chicago (17e ed.) Bronvermelding

Não informado. Directory. The Hague, Holanda: International Federation of Library Associations, 1970.

MLA (8e ed.) Bronvermelding

Não informado. Directory. International Federation of Library Associations, 1970.

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