APA (7th ed.) Zitazioa
Jupp, E. W. (2002). Tunnel watching. Intellect.
Chicago Style (17th ed.) Zitazioa
Jupp, Edmund W. Tunnel Watching. Bristol: Intellect, 2002.
MLA (9th ed.) Zitazioa
Jupp, Edmund W. Tunnel Watching. Intellect, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.