Παραπομπή σε μορφή APA (7η εκδ.)

United States Library of Congress. (1928). Classification. Class P, P-PA: Philology, linguistic, classical philology, classical literature. U. S. Government Printing Office.

Παραπομπή σε μορφή Chicago (17η εκδ.)

United States Library of Congress. Classification. Class P, P-PA: Philology, Linguistic, Classical Philology, Classical Literature. Washington: U. S. Government Printing Office, 1928.

Παραπομπή σε μορφή MLA (9th εκδ.)

United States Library of Congress. Classification. Class P, P-PA: Philology, Linguistic, Classical Philology, Classical Literature. U. S. Government Printing Office, 1928.