APA (7th ed.) Citation

Walker, R. T., & Walker, W. J. (1956). The origin and nature of ore deposits. Walker Associates.

Chicago Style (17th ed.) Citation

Walker, Robert Tunstall, and Woodville Joseph Walker. The Origin and Nature of Ore Deposits. Colorado Springs, Colo.: Walker Associates, 1956.

MLA (9th ed.) Citation

Walker, Robert Tunstall, and Woodville Joseph Walker. The Origin and Nature of Ore Deposits. Walker Associates, 1956.