Barrientos, Z., & Umaña, R. (2009). Student attrition in posgraduate blended programs at the Universidad Estatal a Distancia (UNED), Costa Rica: Desertion or delay?
استشهاد بنمط شيكاغوBarrientos, Zaidett, و Roy Umaña. Student Attrition in Posgraduate Blended Programs At the Universidad Estatal a Distancia (UNED), Costa Rica: Desertion or Delay? 2009.
MLA استشهادBarrientos, Zaidett, و Roy Umaña. Student Attrition in Posgraduate Blended Programs At the Universidad Estatal a Distancia (UNED), Costa Rica: Desertion or Delay? 2009.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.