Cloud, Maria-Elena. "Presente Perfecto- Composición escrita". OER Commons. Institute for the Study of Knowledge Management in Education, 17 Nov. 2017. Web. 07 Jul. 2024. <https://oercommons.org/authoring/25730-presente-perfecto-composici%C3%B3n-escrita>.
Cloud, M. (2017, November 17). Presente Perfecto- Composición escrita. OER Commons. Retrieved July 07, 2024, from https://oercommons.org/authoring/25730-presente-perfecto-composici%C3%B3n-escrita.