National Planning Institute. (2007). The virtual water concept. National Planning Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Planning Institute. The Virtual Water Concept. cairo.: National Planning Institute, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Planning Institute. The Virtual Water Concept. National Planning Institute, 2007.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.