Spiegel, J. (1994). Manager's official guide to team working. Pfeiffer & Co.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpiegel, Jerry. Manager's Official Guide to Team Working. Amsterdam: Pfeiffer & Co, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSpiegel, Jerry. Manager's Official Guide to Team Working. Pfeiffer & Co, 1994.
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