Heyel, C. (1958). Appraising Executive performance. American Book Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHeyel, Carl. Appraising Executive Performance. American Book Company, 1958.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHeyel, Carl. Appraising Executive Performance. American Book Company, 1958.
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