Ditwiler, C. D. (1970). Public water supply in Washington: An economic analysis of enabling laws for public water supply districts. Washington Agricultural Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDitwiler, C. Dirk. Public Water Supply in Washington: An Economic Analysis of Enabling Laws for Public Water Supply Districts. Pullman: Washington Agricultural Experiment Station, 1970.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDitwiler, C. Dirk. Public Water Supply in Washington: An Economic Analysis of Enabling Laws for Public Water Supply Districts. Washington Agricultural Experiment Station, 1970.
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