APA (7th ed.) Citation

Rupert, M. (1999). Improvements to the DRASTIC ground-water vulnerability mapping method. U.S. Dept. of the interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Rupert, Michael. Improvements to the DRASTIC Ground-water Vulnerability Mapping Method. [Reston, Va.]: U.S. Dept. of the interior, U.S. Geological Survey, 1999.

MLA (9th ed.) Citation

Rupert, Michael. Improvements to the DRASTIC Ground-water Vulnerability Mapping Method. U.S. Dept. of the interior, U.S. Geological Survey, 1999.