Costa, P. H. da S.; Tilio, R. C. A Study of Processes in the Activities Headings from an English Coursebook: A Systemic-Functional Perspective of Teaching and Learning Practices. Signótica 2017, 29 (2), Port. 403-429/Eng. 431. https://doi.org/10.5216/sig.v29i2.40009.