Não informado. (1951). Wastes engineering. R.H. Donnelley, Magazine Publishing Division.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Wastes Engineering. New York: R.H. Donnelley, Magazine Publishing Division, 1951.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Wastes Engineering. R.H. Donnelley, Magazine Publishing Division, 1951.
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