Franklin

MLA

Obert, Leonard, and Wilbur I Duvall. Rock Mechanics and the Design of Structures In Rock. .

APA

Obert, L., & Duvall, W. I. Rock mechanics and the design of structures in rock. .

Chicago

Obert, Leonard, and Wilbur I. Duvall. Rock Mechanics and the Design of Structures In Rock.