Não informado. (1970). Directory. International Federation of Library Associations.
Style de citation Chicago (17e éd.)Não informado. Directory. The Hague, Holanda: International Federation of Library Associations, 1970.
Style de citation MLA (8e éd.)Não informado. Directory. International Federation of Library Associations, 1970.
Attention : ces citations peuvent ne pas être correctes à 100%.