Nova, Suherman, and Syaiful. “Improving Of Trigonometry Concept Based On Islamic Value Trough Pocket Book”. Inovasi Pembangunan : Jurnal Kelitbangan 6, no. 03 (December 1, 2018): 291-300. Accessed April 24, 2025. https://jurnal.balitbangda.lampungprov.go.id/index.php/jip/article/view/115.