APA (7th ed.) Zitazioa
Little, A. W. S. American economic Problems.
Chicago Style (17th ed.) Zitazioa
Little, Albert William Selwyn. American Economic Problems.
MLA (9th ed.) Zitazioa
Little, Albert William Selwyn. American Economic Problems.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.