Ditwiler, C. D. (1970). Public water supply in Washington: An economic analysis of enabling laws for public water supply districts. Washington Agricultural Experiment Station.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ditwiler, C. Dirk. Public Water Supply in Washington: An Economic Analysis of Enabling Laws for Public Water Supply Districts. Pullman: Washington Agricultural Experiment Station, 1970.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ditwiler, C. Dirk. Public Water Supply in Washington: An Economic Analysis of Enabling Laws for Public Water Supply Districts. Washington Agricultural Experiment Station, 1970.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.