Valdez, L. G. J. The content validity and predictive ability of the mathematics placement examination in Central Philippine Unoversity.
Chicago-referens (17:e uppl.)Valdez, Luis G. Jr. The Content Validity and Predictive Ability of the Mathematics Placement Examination in Central Philippine Unoversity. Quezon City: College of Education, University of the Philippines, Diliman, 1992.
MLA-referens (9:e uppl.)Valdez, Luis G. Jr. The Content Validity and Predictive Ability of the Mathematics Placement Examination in Central Philippine Unoversity.
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