VAN ZYL, M. H. Challenge to Think, by Christine Frank, Mario Rinvolucri and Marge Berer. English Usage in Southern Africa, [S. l.], v. 20, n. 2, p. 74–76, 1989. Disponível em: https://unisapressjournals.co.za/index.php/EUSA/article/view/5145. Acesso em: 22 jul. 2024.