APA (7th ed.) Zitazioa
(2013). Principles of railway engineering. Charotar.
Chicago Style (17th ed.) Zitazioa
Principles of Railway Engineering. Delhi: Charotar, 2013.
MLA (9th ed.) Zitazioa
Principles of Railway Engineering. Charotar, 2013.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.