Não informado. (1969). Yearbook of international congress proceedings. Union of International Associations.
Chicago-Zitierstil (17. Ausg.)Não informado. Yearbook of International Congress Proceedings. Brussels: Union of International Associations, 1969.
MLA-Zitierstil (8. Ausg.)Não informado. Yearbook of International Congress Proceedings. Union of International Associations, 1969.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.