HEINZ, M. S. A Cloze-styled Textual Enhancement Targeting Prepositions. International Journal of Learning, Teaching and Educational Research, [S. l.], v. 16, n. 10, p. 18–26, 2017. Disponível em: http://www.ijlter.net/index.php/ijlter/article/view/776. Acesso em: 18 apr. 2026.