Ali, Karker Ali, and Nor Azmi Mostafa. “Errors in Using Past Tense Form in Writing Essays Among Kurdish University Learners”. AJELP: Asian Journal of English Language and Pedagogy, vol. 1, Dec. 2013, pp. 176-89, https://ejournal.upsi.edu.my/index.php/AJELP/article/view/1093.