Van Dalen, D. B. (1966). Understanding educational research: An introduction (Enl., rev.). McGraw-Hill.
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Chicago-čujuhus (17. p.)
Van Dalen, Deobold B. Understanding Educational Research: An Introduction. Enl., rev. New York: McGraw-Hill, 1966.
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MLA-čujuhus (9. p.)
Van Dalen, Deobold B. Understanding Educational Research: An Introduction. Enl., rev. McGraw-Hill, 1966.
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