Espín Sandoval, Luis Fernando, UNIVERSIDAD TECNICA DE AMBATO, Ecuador
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Revista Publicando Vol. 4 No. 12 (1) (2017): Vol 4. No 12 (1) 2017 Cultural and Social Studies
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Revista Publicando Vol. 4 No. 12 (1) (2017): Vol 4. No 12 (1) 2017 Cultural and Social Studies