Siswasusila, P. (2017) “Implementation of Cooperative Learning Through Crossword Puzzle Strategy to Increase the Motivation of Grade 5 Students: Implementasi Cooperative Learning Melalui Strategi Crossword Puzzle Untuk Meningkatkan Motivasi Siswa Kelas 5”, Madrosatuna: Journal of Islamic Elementary School, 1(2), pp. 89–104. doi: 10.21070/madrosatuna.v2i1.1848.