APA

Obert L., Duvall W. I., . (1967). Rock mechanics an the desing of structures in rock. New York: J. Wiley.

Chicago

Obert Leonard, Duvall Wilbur I, . 1967. Rock mechanics an the desing of structures in rock. New York: J. Wiley.

Harvard

Obert L., Duvall W. I., . (1967). Rock mechanics an the desing of structures in rock. New York: J. Wiley.

MLA

Obert Leonard, Duvall Wilbur I, . Rock mechanics an the desing of structures in rock. New York: J. Wiley. 1967.