River Valleys Development Board. Annual report. The Board.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRiver Valleys Development Board. Annual Report. Colombo: The Board.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRiver Valleys Development Board. Annual Report. The Board.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.