APA (7th ed.) Citation

(1927). Classification. Class Z: Bibliography and library science (3rd ed. January, 1926.). U. S. Government Printing Office.

Chicago Style (17th ed.) Citation

Classification. Class Z: Bibliography and Library Science. 3rd ed. January, 1926. Washington: U. S. Government Printing Office, 1927.

MLA (9th ed.) Citation

Classification. Class Z: Bibliography and Library Science. 3rd ed. January, 1926. U. S. Government Printing Office, 1927.