Não informado. (1969). Yearbook of international congress proceedings. Union of International Associations.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Yearbook of International Congress Proceedings. Brussels: Union of International Associations, 1969.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Yearbook of International Congress Proceedings. Union of International Associations, 1969.
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