APA (7th ed.) Citation

U.S. Symposium on Rock Mechanics Colorado School of Mines, Colo, Hustrulid, W. A., & Johnson, G. A. (1990). Rock mechanics contributions and challenges: Proceedings of the 31st U.S. symposium. Balkema.

Chicago Style (17th ed.) Citation

U.S. Symposium on Rock Mechanics Colorado School of Mines, Colo, W. A. Hustrulid, and Guy A. Johnson. Rock Mechanics Contributions and Challenges: Proceedings of the 31st U.S. Symposium. Rotterdam, Netherlands: Balkema, 1990.

MLA (8th ed.) Citation

U.S. Symposium on Rock Mechanics Colorado School of Mines, Colo, et al. Rock Mechanics Contributions and Challenges: Proceedings of the 31st U.S. Symposium. Balkema, 1990.