Battle, E. S. (1967). Achievement values, standards and expectations: Their effect on children's task persistence and academic competence. University Microfilms.
Παραπομπή σε μορφή Chicago (17η εκδ.)Battle, Esther Steinhauer. Achievement Values, Standards and Expectations: Their Effect on Children's Task Persistence and Academic Competence. [Ann Arbor, Mich: University Microfilms, 1967.
Παραπομπή σε μορφή MLA (9th εκδ.)Battle, Esther Steinhauer. Achievement Values, Standards and Expectations: Their Effect on Children's Task Persistence and Academic Competence. University Microfilms, 1967.
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