Não informado. (1969). IFLA Annual. International Federation of Library Associations and Institutions.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. IFLA Annual. Munich, Alemanha: International Federation of Library Associations and Institutions, 1969.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. IFLA Annual. International Federation of Library Associations and Institutions, 1969.
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