Cox, J. W. (1928). Mechanical aptitude: Its existence, nature and measurement. Methuen & Co.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCox, John William. Mechanical Aptitude: Its Existence, Nature and Measurement. London: Methuen & Co, 1928.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCox, John William. Mechanical Aptitude: Its Existence, Nature and Measurement. Methuen & Co, 1928.
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