Ali, Ferdinandus, 		Jehadus, Emilianus, AND 		Fedi, Sebastianus.
" Pengembangan Metode Diskusi Bermuatan Presentasi Sistem Rotasi Pada Mata Kuliah Trigonometri" <em>Journal of Medives : Journal of Mathematics Education IKIP Veteran Semarang</em> [Online], Volume 3 Number 2 (31 July 2019)