APA (7th ed.) Citation

McDonald, M. G., & Harbaugh, A. W. (1988). A modular three-dimensional finite-difference ground-water flow model. U. S. Department of the Interior.

Chicago Style (17th ed.) Citation

McDonald, Michael G., and Arlen W. Harbaugh. A Modular Three-dimensional Finite-difference Ground-water Flow Model. Washington: U. S. Department of the Interior, 1988.

MLA (8th ed.) Citation

McDonald, Michael G., and Arlen W. Harbaugh. A Modular Three-dimensional Finite-difference Ground-water Flow Model. U. S. Department of the Interior, 1988.