Dyfyniad APA

(2007). Principles of town water supply and sanitation. Washington DC: The World Bank.

Dyfyniad Arddull Chicago

Principles of Town Water Supply and Sanitation. Washington DC: The World Bank, 2007.

Dyfyniad MLA

Principles of Town Water Supply and Sanitation. Washington DC: The World Bank, 2007.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.