Παραπομπή σε μορφή APA (7η εκδ.)

Library of Congress. Classification Division. (1951). Classification. Class L: Education (3rd ed.). U. S. Government Printing Office.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Library of Congress. Classification Division. Classification. Class L: Education. 3rd ed. Washington: U. S. Government Printing Office, 1951.

Παραπομπή σε μορφή MLA (9th εκδ.)

Library of Congress. Classification Division. Classification. Class L: Education. 3rd ed. U. S. Government Printing Office, 1951.