Não informado. (1938). Occupational Psychology. National Institute of Industrial Psychology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Occupational Psychology. London: National Institute of Industrial Psychology, 1938.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Occupational Psychology. National Institute of Industrial Psychology, 1938.
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