Showen, C. R., & Stuthmann, N. G. (1973). Index to U.S. Geological Survey computer files containing daily values for water parameters to September 30, 1971: Central Region. U.S. Geological Survey.
Chicago Style (17th ed.) CitationShowen, Charles R., and Neil G. Stuthmann. Index to U.S. Geological Survey Computer Files Containing Daily Values for Water Parameters to September 30, 1971: Central Region. Washington, D.C.: U.S. Geological Survey, 1973.
MLA (9th ed.) CitationShowen, Charles R., and Neil G. Stuthmann. Index to U.S. Geological Survey Computer Files Containing Daily Values for Water Parameters to September 30, 1971: Central Region. U.S. Geological Survey, 1973.
Warning: These citations may not always be 100% accurate.