370.072
V217U
           Van Dalen, Deobold B
               Understanding educational research an introduction \ Deobold B Van Dalen - New York : McGraw-Hill, 1962.
               xi, 432p. - McGraw-Hill series in education/ed by Harold Benjamin (Psychology and human development in education/ed by Nicholas Hobbs) .
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                Subjects: Education-Research-Mexico; Education-Evaluation-Evaluation; Education-Statistics.