Não informado. (1952). Refrigeration service and contracting. Refrigeration Service Engineers Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Refrigeration Service and Contracting. Chicago, Ill: Refrigeration Service Engineers Society, 1952.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Refrigeration Service and Contracting. Refrigeration Service Engineers Society, 1952.
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