Rich, L. G. (1961). UNIT OPERATIONS OF SANITARY ENGINEERING. John Willey & Sons, Inc.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRich, Linvil G. UNIT OPERATIONS OF SANITARY ENGINEERING. John Willey & Sons, Inc, 1961.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRich, Linvil G. UNIT OPERATIONS OF SANITARY ENGINEERING. John Willey & Sons, Inc, 1961.
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