APA (7th ed.) Zitazioa
Introductory geotechnical engineering / Chottopadhyay, B.C: Vikas Pub.
Chicago Style (17th ed.) Zitazioa
Introductory Geotechnical Engineering / Chottopadhyay, B.C: Vikas Pub.
MLA (9th ed.) Zitazioa
Introductory Geotechnical Engineering / Chottopadhyay, B.C: Vikas Pub.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.