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1Izdano 2004“...U.S. Dept. of State, Bureau of International Information Programs,...”
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2od Lim, Edwin Charng Yih“...Dept. of Management Science and Information Systems, University of Auckland,...”
Izdano 1998
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3od Mezirow, Jack, 1923-“...U.S. Dept. of Health, Education & Welfare, National Institute of Education, Educational Resources Information Center,...”
Izdano 1979
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