Orr, C. E., & DeVault, M. V. (1959). Geology. Steck.
Chicago Style (17th ed.) CitationOrr, Catherine Elizabeth, and M. Vere DeVault. Geology. Austin, Tex: Steck, 1959.
MLA (9th ed.) CitationOrr, Catherine Elizabeth, and M. Vere DeVault. Geology. Steck, 1959.
Warning: These citations may not always be 100% accurate.