1 หนังสืออิเล็กทรอนิกส์โดย London) Webb Eugene J. (Northwood College
Donald T. (Lehigh University, USA) Campbell & Richard D. (Syracuse University, New York, USA) Schwartz: Unobtrusive Measures
Thirty-five years ago, the four authors of this book addressed the problems of validity in social science research. They were interested in new and unused methods for obtaining information. The origi …
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