COTTAM ANGELA. (1999). MANAGEMENT AND MARKETING OF SERVICES (2ND.). BUTTERWORTH-HEINEMANN.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCOTTAM ANGELA. MANAGEMENT AND MARKETING OF SERVICES. 2ND. LONDON: BUTTERWORTH-HEINEMANN, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCOTTAM ANGELA. MANAGEMENT AND MARKETING OF SERVICES. 2ND. BUTTERWORTH-HEINEMANN, 1999.
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