Acuña Somarribas, D. y. . V. V. (1999). Oral activities used in ten third grade classrooms in public schools of the metropolitan area in Costa Rica. Universidad de CostaRica, Escuela de Lenguas Modernas.
Chicago-čujuhus (17. p.)Acuña Somarribas, Diego y Vargas Vargas. Oral Activities Used in Ten Third Grade Classrooms in Public Schools of the Metropolitan Area in Costa Rica. San José, Costa Rica: Universidad de CostaRica, Escuela de Lenguas Modernas, 1999.
MLA-čujuhus (9. p.)Acuña Somarribas, Diego y Vargas Vargas. Oral Activities Used in Ten Third Grade Classrooms in Public Schools of the Metropolitan Area in Costa Rica. Universidad de CostaRica, Escuela de Lenguas Modernas, 1999.
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