GLEN, H. A new Certificate of Proficiency English Course for Foreign Students with Use of English, by Ona Low. English Usage in Southern Africa, [S. l.], v. 5, n. 2, p. 30–32, 1974. Disponível em: https://unisapressjournals.co.za/index.php/EUSA/article/view/5510. Acesso em: 22 jul. 2024.