Não informado. (1969). IFLA Annual. International Federation of Library Associations and Institutions.
Chicago-referens (17:e uppl.)Não informado. IFLA Annual. Munich, Alemanha: International Federation of Library Associations and Institutions, 1969.
MLA-referens (8:e uppl.)Não informado. IFLA Annual. International Federation of Library Associations and Institutions, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.