Karlson David. (2004). Marketing Your Consulting or Professional Services. Viva Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKarlson David. Marketing Your Consulting or Professional Services. New Delhi: Viva Books, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKarlson David. Marketing Your Consulting or Professional Services. Viva Books, 2004.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.