Pontes, Valdecy Oliveira, et al. “The Uses of the Present Perfect in Spanish: Una Perspectiva sociolingüística Y pedagógica ”. Domínios De Lingu@gem, vol. 10, no. 3, Aug. 2016, pp. 1112-3, https://doi.org/10.14393/DL23-v10n3a2016-17.