Villarreal, D. (2006). Research as a change factor, interest and participation grows. Universidad Autónoma de Tamaulipas.
Čikaški stil citiranja (17. izdanje)Villarreal, Diana. Research as a Change Factor, Interest and Participation Grows. Universidad Autónoma de Tamaulipas, 2006.
MLA način citiranja (8. izdanje)Villarreal, Diana. Research as a Change Factor, Interest and Participation Grows. Universidad Autónoma de Tamaulipas, 2006.
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