United States Library of Congress. (1928). Classification. Class P, P-PA: Philology, linguistic, classical philology, classical literature. U. S. Government Printing Office.
Chicago-referens (17:e uppl.)United States Library of Congress. Classification. Class P, P-PA: Philology, Linguistic, Classical Philology, Classical Literature. Washington: U. S. Government Printing Office, 1928.
MLA-referens (9:e uppl.)United States Library of Congress. Classification. Class P, P-PA: Philology, Linguistic, Classical Philology, Classical Literature. U. S. Government Printing Office, 1928.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.