Obert, L., & Duvall, W. I. (1967). Rock mechanics and the design of structures in rock (1a. ed.). John Wiley and Sons.
Citace podle Chicago (17th ed.)Obert, Leonard, a Wilbur I. Duvall. Rock Mechanics and the Design of Structures in Rock. 1a. ed. Nueva York: John Wiley and Sons, 1967.
Citace podle MLA (9th ed.)Obert, Leonard, a Wilbur I. Duvall. Rock Mechanics and the Design of Structures in Rock. 1a. ed. John Wiley and Sons, 1967.
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