Vela-Esquivel, P. (2007). Stress and study, worrying combination. Universidad Autónoma de Tamaulipas.
Čikaški stil citiranja (17. izdanje)Vela-Esquivel, Paulina. Stress and Study, Worrying Combination. Universidad Autónoma de Tamaulipas, 2007.
MLA način citiranja (8. izdanje)Vela-Esquivel, Paulina. Stress and Study, Worrying Combination. Universidad Autónoma de Tamaulipas, 2007.
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