Graw, L. H. (1994). Service purchasing: What every buyer should know LeRoy H. Graw, Deidre M. Maples. Van Nostrand Reinhold.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGraw, LeRoy H. Service Purchasing: What Every Buyer Should Know LeRoy H. Graw, Deidre M. Maples. Van Nostrand Reinhold, 1994.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGraw, LeRoy H. Service Purchasing: What Every Buyer Should Know LeRoy H. Graw, Deidre M. Maples. Van Nostrand Reinhold, 1994.
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