APA (7th ed.) Citation

Case, R. B., & Ristau, T. K. (1981). Small water purification systems. U.S. Dept. of the Interior, Bureau of Land Management : Available from Denver Service Center.

Chicago Style (17th ed.) Citation

Case, Richard B., and Toni K. Ristau. Small Water Purification Systems. Denver, Colo.: U.S. Dept. of the Interior, Bureau of Land Management : Available from Denver Service Center, 1981.

MLA (9th ed.) Citation

Case, Richard B., and Toni K. Ristau. Small Water Purification Systems. U.S. Dept. of the Interior, Bureau of Land Management : Available from Denver Service Center, 1981.