Vela-Esquivel, P. (2007). Stress and study, worrying combination. Universidad Autónoma de Tamaulipas.
Chicago Style (17. basım) AtıfVela-Esquivel, Paulina. Stress and Study, Worrying Combination. Universidad Autónoma de Tamaulipas, 2007.
MLA (8th ed.) AtıfVela-Esquivel, Paulina. Stress and Study, Worrying Combination. Universidad Autónoma de Tamaulipas, 2007.
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