Meléndez, Lorena, and Sarah Iza. “Application of the Flipped Classroom Methodology in a Virtual Platform for Teaching English Language Grammar in Level B1”. Revista Publicando, vol. 4, no. 12 (1), Sept. 2017, pp. 236-4, https://revistapublicando.org/revista/index.php/crv/article/view/655.