APA (7th ed.) Citation

Barton, N., Lien, R., & Lunde, J. (1974). Engineering classification of rock masses for the design of tunnel support. Norges Geotekniske Inst.

Chicago Style (17th ed.) Citation

Barton, Nick, Reidar Lien, and J. Lunde. Engineering Classification of Rock Masses for the Design of Tunnel Support. Oslo: Norges Geotekniske Inst, 1974.

MLA (9th ed.) Citation

Barton, Nick, et al. Engineering Classification of Rock Masses for the Design of Tunnel Support. Norges Geotekniske Inst, 1974.