Sanders, R. J. (1977). Alternative concepts of marginal cost for public utility pricing: Problems of application in the water supply sector. World Bank.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sanders, Roberts J. Alternative Concepts of Marginal Cost for Public Utility Pricing: Problems of Application in the Water Supply Sector. Washington: World Bank, 1977.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Sanders, Roberts J. Alternative Concepts of Marginal Cost for Public Utility Pricing: Problems of Application in the Water Supply Sector. World Bank, 1977.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.