HELLRIEGEL DON. (2002). MANAGEMENT: COMPETENCY BASED APPROACH (9TH.). THOMSON SOUTH-WESTERN.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHELLRIEGEL DON. MANAGEMENT: COMPETENCY BASED APPROACH. 9TH. AUSTRALIA: THOMSON SOUTH-WESTERN, 2002.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHELLRIEGEL DON. MANAGEMENT: COMPETENCY BASED APPROACH. 9TH. THOMSON SOUTH-WESTERN, 2002.
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