Chapman, D., Metje, N., & Stark, A. (2010). Introduction to tunnel construction. Spon.
Chicago Style aipamenaChapman, David, Nicole Metje, and Alfred Stark. Introduction to Tunnel Construction. Oxon: Spon, 2010.
MLA aipamenaChapman, David, et al. Introduction to Tunnel Construction. Spon, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.