DUGGER, J. (1992). Business Letter For Busy People Jim Dugger. Golden Books Centre.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDUGGER, Jim. Business Letter For Busy People Jim Dugger. Golden Books Centre, 1992.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDUGGER, Jim. Business Letter For Busy People Jim Dugger. Golden Books Centre, 1992.
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