International Federation of Library Associations and Institutions. World Congress, International Federation of Library Associations and Institutions, Koops, W. R. H., & Vosper, R. (1980). Libraries for all: A world of books and their readers : papers presented at the IFLA 50th anniversary world congress, Brussels 1977 = Bibliotheques pour tous : le monde du livre et de ses lecteures. K.G. Saur.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Federation of Library Associations and Institutions. World Congress, International Federation of Library Associations and Institutions, Willem R. H. Koops, و Robert Vosper. Libraries for All: A World of Books and Their Readers : Papers Presented at the IFLA 50th Anniversary World Congress, Brussels 1977 = Bibliotheques Pour Tous : Le Monde Du Livre Et De Ses Lecteures. Munchen ; New York: K.G. Saur, 1980.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)International Federation of Library Associations and Institutions. World Congress, et al. Libraries for All: A World of Books and Their Readers : Papers Presented at the IFLA 50th Anniversary World Congress, Brussels 1977 = Bibliotheques Pour Tous : Le Monde Du Livre Et De Ses Lecteures. K.G. Saur, 1980.