Aula Virtual
British Council. (2023). LearnEnglish: Grammar, Vocabulary and Pronunciation. https://learnenglish.britishcouncil.org
Cambridge University Press. (2022). Cambridge Dictionary Online. https://dictionary.cambridge.org
Murphy, R. (2019). English Grammar in Use (5.ª ed.). Cambridge University Press.
Oxford University Press. (2023). Oxford Learner’s Dictionaries. https://www.oxfordlearnersdictionaries.com
Swan, M. (2016). Practical English Usage (4.ª ed.). Oxford University Press.