Singapore. Public Utilities Board. (1980). Singapore's water supply. Public Utilities Board.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSingapore. Public Utilities Board. Singapore's Water Supply. Singapore: Public Utilities Board, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSingapore. Public Utilities Board. Singapore's Water Supply. Public Utilities Board, 1980.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.