Sianturi, Lasta Pita Duinarti, Dumaris E. Silalahi, and Christian Neni Purba. 2020. “Improving Students’ Writing Ability Based on Higher Order Thinking Skills (HOTS) Questions at 8th Grade in SMP Swasta Kartika 1-4 Pematangsiantar”. Journal of English Teaching As a Foreign Language 6 (2):1-17. https://ejournal.uhn.ac.id/index.php/jetafl/article/view/103.