Perlaza Díaz, Claudia Patricia, and Verónica María Henao Ramírez. “Class Protocol As a Guiding Activity in Teaching at the Second Grade of Elementary School”. Ciencias Sociales Y Educación, vol. 6, no. 11, Feb. 2018, pp. 71-92, https://doi.org/10.22395/csye.v6n11a4.