APA (7th ed.) Citation

Library of Congress & Guerrier, E. (1919). Federal executive departments as sources of information for libraries. U.S. GPO.

Chicago Style (17th ed.) Citation

Library of Congress and Edith Guerrier. Federal Executive Departments as Sources of Information for Libraries. Washington: U.S. GPO, 1919.

MLA (9th ed.) Citation

Library of Congress and Edith Guerrier. Federal Executive Departments as Sources of Information for Libraries. U.S. GPO, 1919.