American Water Works Association, Valentine, M., & Armstrong, C. (2014). Groundwater (Fourth edition.). American Water Works Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAmerican Water Works Association, Melissa Valentine, और Cheryl Armstrong. Groundwater. Fourth edition. Denver, Colorado: American Water Works Association, 2014.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAmerican Water Works Association, et al. Groundwater. Fourth edition. American Water Works Association, 2014.
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