APA (7th ed.) Citation

Downs, R. B. (1951). American library resources: A bibliographical guide. American Library Association.

Chicago Style (17th ed.) Citation

Downs, Robert Bingham. American Library Resources: A Bibliographical Guide. Chicago: American Library Association, 1951.

MLA (9th ed.) Citation

Downs, Robert Bingham. American Library Resources: A Bibliographical Guide. American Library Association, 1951.