Bernhardsen, T. (2002). Geographic information systems an introduction: An introduction. New York, NY: Wiley.
शिकागो स्टाइल उद्धरणBernhardsen, Tor. Geographic Information Systems an Introduction: An Introduction. New York, NY: Wiley, 2002.
एमएलए उद्धरणBernhardsen, Tor. Geographic Information Systems an Introduction: An Introduction. New York, NY: Wiley, 2002.
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