[1]
P. H. da S. Costa and R. C. Tilio, “A study of processes in the activities headings from an english coursebook: a systemic-functional perspective of teaching and learning practices”, Signótica, vol. 29, no. 2, pp. Port. 403–429/Eng. 431, Aug. 2017, doi: 10.5216/sig.v29i2.40009.