Citazione Stile APA (7a Edizione)

Koops, W. R. H., & Wieder, J. (1977). IFLA's first fifty years: Achievement and challenge in international librarianship. Verlag Dokumentation.

Citazione stile Chigago Style (17a edizione)

Koops, Willem R. H., e Joachim Wieder. IFLA's First Fifty Years: Achievement and Challenge in International Librarianship. Munchen: Verlag Dokumentation, 1977.

Citatione MLA (8a ed.)

Koops, Willem R. H., e Joachim Wieder. IFLA's First Fifty Years: Achievement and Challenge in International Librarianship. Verlag Dokumentation, 1977.