International Federation of Library Associations and Institutions. Section on Government Information and Official Publications & Kagan, A. (1991). Reference service for publications of intergovernmental organizations: Papers from an IFLA workshop, Paris, August 24, 1989. K.G. Saur.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Federation of Library Associations and Institutions. Section on Government Information and Official Publications و Alfred Kagan. Reference Service for Publications of Intergovernmental Organizations: Papers from an IFLA Workshop, Paris, August 24, 1989. Munchen ; New York: K.G. Saur, 1991.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)International Federation of Library Associations and Institutions. Section on Government Information and Official Publications و Alfred Kagan. Reference Service for Publications of Intergovernmental Organizations: Papers from an IFLA Workshop, Paris, August 24, 1989. K.G. Saur, 1991.