Watkins, G. S. (1922). An introduction to the study of labor problems. Thomas Y. Crowell Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWatkins, Gordon S. An Introduction to the Study of Labor Problems. New York: Thomas Y. Crowell Co., 1922.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWatkins, Gordon S. An Introduction to the Study of Labor Problems. Thomas Y. Crowell Co., 1922.
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