Napitupulu, F. D. . “Socratic Questions Used by the Sixth Semester Students of English Department of FKIP Nommensen in Seminar Class”. Journal of English Teaching As a Foreign Language, vol. 2, no. 1, June 2016, pp. 59-68, https://ejournal.uhn.ac.id/index.php/jetafl/article/view/161.