E. Cahyaningtyas, B. Widiyanto, and M. Kusuma, “Penguatan Sikap Peduli Lingkungan Peserta Didik melalui Pendekatan Jelajah Alam Sekitar (JAS) Berbasis Model Problem Base Learning (PBL)”, cakrawala, vol. 13, no. 2, pp. 56–63, Nov. 2019.