Friesen, M. E. (1998). The internal sell: Encouraging executive influence and accomplishment. Quorum Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFriesen, Michael E. The Internal Sell: Encouraging Executive Influence and Accomplishment. Westport, Conn.: Quorum Books, 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFriesen, Michael E. The Internal Sell: Encouraging Executive Influence and Accomplishment. Quorum Books, 1998.
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