Laengkang, A. G., A. R. Ab Karim, and R. Haron. “Speech Act of Commissives and Expressives: A Case Study on the Speech of Tun Dr. Mahathir in the 1MDB Issue”. International Online Journal of Language, Communication, and Humanities, Vol. 3, no. 2, Oct. 2020, pp. 73-91, http://insaniah.umk.edu.my/journal/index.php/insaniah/article/view/97.