Wehefritz, V. (1974). International loan services and union catalogues: Publ. by the Committee on Union Catalogues and Internat. Loans of the Internat. Federation of Library Associations under the editorship of Valentin Wehefritz ([1st ed.].). Klostermann.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Wehefritz, Valentin. International Loan Services and Union Catalogues: Publ. by the Committee on Union Catalogues and Internat. Loans of the Internat. Federation of Library Associations Under the Editorship of Valentin Wehefritz. [1st ed.]. Frankfurt am Main: Klostermann, 1974.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Wehefritz, Valentin. International Loan Services and Union Catalogues: Publ. by the Committee on Union Catalogues and Internat. Loans of the Internat. Federation of Library Associations Under the Editorship of Valentin Wehefritz. [1st ed.]. Klostermann, 1974.