PUFFETT, R. (1990). Plumbing Services Volume 1, Basic Skill Water Supply Rj Puffett, Lj. Hossack. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPUFFETT, RJ. Plumbing Services Volume 1, Basic Skill Water Supply Rj Puffett, Lj. Hossack. McGraw-Hill, 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPUFFETT, RJ. Plumbing Services Volume 1, Basic Skill Water Supply Rj Puffett, Lj. Hossack. McGraw-Hill, 1990.
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