APA (7th ed.) Citation

United States Library of Congress Classification Division. (1938). Classification. Subclass PT, part 1: German literature. U. S. Government Printing Office.

Chicago Style (17th ed.) Citation

United States Library of Congress Classification Division. Classification. Subclass PT, Part 1: German Literature. Washington: U. S. Government Printing Office, 1938.

MLA (9th ed.) Citation

United States Library of Congress Classification Division. Classification. Subclass PT, Part 1: German Literature. U. S. Government Printing Office, 1938.