Heyel, C. (1962). Management for modern supervisors. American Management Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHeyel, Carl. Management for Modern Supervisors. New York: American Management Association, 1962.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHeyel, Carl. Management for Modern Supervisors. American Management Association, 1962.
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