MAFTOON, P.; SHAHINI, A. S. CALL normalization: A survey on inhibitive factors. The JALT CALL Journal, Melbourne, Australia, v. 8, n. 1, p. 17–32, 2012. DOI: 10.29140/jaltcall.v8n1.131. Disponível em: https://www.castledown.com.au/journals/jaltcall/article/view/jaltcall.v8n1.131. Acesso em: 22 sep. 2026.