Citazione Stile APA (7a Edizione)

United States Library of Congress Classification Division. (1937). Classification. Subclass PQ, part 2: Italian, Spanish, and Portuguese literatures (Printed as manuscript.). U. S. Government Printing Office.

Citazione stile Chigago Style (17a edizione)

United States Library of Congress Classification Division. Classification. Subclass PQ, Part 2: Italian, Spanish, and Portuguese Literatures. Printed as manuscript. Washington: U. S. Government Printing Office, 1937.

Citatione MLA (9a ed.)

United States Library of Congress Classification Division. Classification. Subclass PQ, Part 2: Italian, Spanish, and Portuguese Literatures. Printed as manuscript. U. S. Government Printing Office, 1937.