Davis, R. H., Alexander, L. T., & Yelon, S. L. (1974). Learning system design: An approach to the improvement of instruction. McGraw-Hill.
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Chicago-čujuhus (17. p.)
Davis, Robert H., Lawrence T. Alexander, juo Stephen L. Yelon. Learning System Design: An Approach to the Improvement of Instruction. New York: McGraw-Hill, 1974.
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MLA-čujuhus (9. p.)
Davis, Robert H., et al. Learning System Design: An Approach to the Improvement of Instruction. McGraw-Hill, 1974.
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