Parkhurst, D. L., & Charlton, S. R. (2008). NetpathXL, an Excel interface to the program NETPATH (Version 1.0.). U.S. Dept. of the Interior, U.S. Geological Survey.
Chicago Style (17th ed.) CitationParkhurst, David L., and Scott R. Charlton. NetpathXL, an Excel Interface to the Program NETPATH. Version 1.0. Reston, Va.: U.S. Dept. of the Interior, U.S. Geological Survey, 2008.
MLA (9th ed.) CitationParkhurst, David L., and Scott R. Charlton. NetpathXL, an Excel Interface to the Program NETPATH. Version 1.0. U.S. Dept. of the Interior, U.S. Geological Survey, 2008.
Warning: These citations may not always be 100% accurate.