Cox, S. E., & Liebscher, H. (1999). Ground-water quality data from the Abbotsford-Sumas aquifer of southwestern British Columbia and northwestern Washington State, February 1997. U.S. Geological Survey.
Chicago Style (17th ed.) CitationCox, Stephen E., and Hugh Liebscher. Ground-water Quality Data from the Abbotsford-Sumas Aquifer of Southwestern British Columbia and Northwestern Washington State, February 1997. Tacoma, Washington: U.S. Geological Survey, 1999.
MLA (9th ed.) CitationCox, Stephen E., and Hugh Liebscher. Ground-water Quality Data from the Abbotsford-Sumas Aquifer of Southwestern British Columbia and Northwestern Washington State, February 1997. U.S. Geological Survey, 1999.
Warning: These citations may not always be 100% accurate.