Não informado. (1982). Noise Control Engineering Journal. Institute of Noise Control Engineering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Noise Control Engineering Journal. Poughkeepie, NY: Institute of Noise Control Engineering, 1982.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Noise Control Engineering Journal. Institute of Noise Control Engineering, 1982.
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