توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

United States Library of Congress Classification Division. (1957). Classification, Class P, subclass PT, part 1: German literature, with supplementary pages. U. S. Government Printing Office.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

United States Library of Congress Classification Division. Classification, Class P, Subclass PT, Part 1: German Literature, with Supplementary Pages. Washington: U. S. Government Printing Office, 1957.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

United States Library of Congress Classification Division. Classification, Class P, Subclass PT, Part 1: German Literature, with Supplementary Pages. U. S. Government Printing Office, 1957.