APA (7th ed.) Zitazioa
Freed, P. E. (1979). Towers to eternity. Sceptre Books.
Chicago Style (17th ed.) Zitazioa
Freed, Paul E. Towers to Eternity. Nashville: Sceptre Books, 1979.
MLA (9th ed.) Zitazioa
Freed, Paul E. Towers to Eternity. Sceptre Books, 1979.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.