Peterson's (Firm) & University Continuing Education Association. (1996). Peterson's distance learning, 1997. Peterson's.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPeterson's (Firm) और University Continuing Education Association. Peterson's Distance Learning, 1997. Princeton, N. J: Peterson's, 1996.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPeterson's (Firm) और University Continuing Education Association. Peterson's Distance Learning, 1997. Peterson's, 1996.
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