DICKSON DEN. (1986). IMPROVE YOUR BUSINESS: WORK BOOK. INTERNATIONAL LABOUR ORGANIZATION.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDICKSON DEN. IMPROVE YOUR BUSINESS: WORK BOOK. GENEVA: INTERNATIONAL LABOUR ORGANIZATION, 1986.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDICKSON DEN. IMPROVE YOUR BUSINESS: WORK BOOK. INTERNATIONAL LABOUR ORGANIZATION, 1986.
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