Kijk- en luistergids : audiovisuele materialen in de praktijk van de openbare bibliotheek / J.L. de Vries ; met medew. van H.H. Hessels en M. TimmerThe History of the International Federation of Library Associations : from its creation to the Second World War, 1927-1940 / J.L. de VriesThe history of the International Federation of Library Associations : from its creation to the Second World War, 1927-1940 / by Johanna L. de Vries