Cárdenas, M.L.B. e Malagon, L. 2007. The formation of study groups: experiences in the outset of a permanent English teacher development program. Signum: Estudos da Linguagem. 10, 1 (jul. 2007), 73–94. DOI:https://doi.org/10.5433/2237-4876.2007v10n1p73.