K. I. Astuningtias and O. D. Appulembang, “Penerapan Metode Drill Untuk Meningkatkan Hasil Belajar Kognitif Siswa Kelas IX Materi Statistika di Smp Kristen Rantepao [The Implementation of the Drill Method to Improve Cognitive Learning Outcomes of Grade 9 Students Studying Statistics at a Christian Junior High School in Rantepao]”, JOHME, vol. 1, no. 1, pp. 53–59, Dec. 2017.