APA (7th ed.) Citation

Obert, L., & Duvall, W. I. (1967). Rock mechanics and the design of structures in rock (1a. ed.). John Wiley and Sons.

Chicago Style (17th ed.) Citation

Obert, Leonard, and Wilbur I. Duvall. Rock Mechanics and the Design of Structures in Rock. 1a. ed. Nueva York: John Wiley and Sons, 1967.

MLA (9th ed.) Citation

Obert, Leonard, and Wilbur I. Duvall. Rock Mechanics and the Design of Structures in Rock. 1a. ed. John Wiley and Sons, 1967.