Hidayati, Armawati, Mustaji Mustaji, and Hari Sugiharto. 2019. “Pengembangan Lembar Kerja Peserta Didik Berbasis Praktikum Model Problem Based Pada Pembelajaran IPS”. The Indonesian Journal of Social Studies 2 (1):51-58. https://doi.org/10.26740/ijss.v2n1.p51-58.