APA (7e ed.) Bronvermelding

Koops, W. R. H., & Wieder, J. (1977). IFLA's First Fifty Years. Achievement and challenge in international librarianship. De Gruyter. https://doi.org/10.1515/9783111356655

Chicago (17e ed.) Bronvermelding

Koops, Willem Roelf Henderikus, en Joachim Wieder. IFLA's First Fifty Years. Achievement and Challenge in International Librarianship. De Gruyter, 1977. https://doi.org/10.1515/9783111356655.

MLA (9e ed.) Bronvermelding

Koops, Willem Roelf Henderikus, en Joachim Wieder. IFLA's First Fifty Years. Achievement and Challenge in International Librarianship. De Gruyter, 1977. https://doi.org/10.1515/9783111356655.