Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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