Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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