Bradley, P. D. (1956). Involuntary participation in unionism. American Enterprise Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBradley, Philip D. Involuntary Participation in Unionism. Washington: American Enterprise Association, 1956.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBradley, Philip D. Involuntary Participation in Unionism. American Enterprise Association, 1956.
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