Dyfyniad APA

National Planning Institute. (2007). The virtual water concept. National Planning Institute.

Dyfyniad Arddull Chicago

National Planning Institute. The Virtual Water Concept. cairo.: National Planning Institute, 2007.

Dyfyniad MLA

National Planning Institute. The Virtual Water Concept. National Planning Institute, 2007.

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