JOHNSTON ROBERT B. (1998). TRADING SYSTEMS AND ELECTRONIC COMMERCE. ERUDITIONS PUB.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJOHNSTON ROBERT B. TRADING SYSTEMS AND ELECTRONIC COMMERCE. AUSTRALIA: ERUDITIONS PUB, 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJOHNSTON ROBERT B. TRADING SYSTEMS AND ELECTRONIC COMMERCE. ERUDITIONS PUB, 1998.
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