Novianti, Wina Kyky, and Sugiyono Sugiyono. 2018. “FACTORS CAUSING HISTORY TEACHERS’ DIFFICULTIES IN DEVELOPING INSTRUCTIONAL TEACHING IN SLEMAN REGENCY, YOGYAKARTA”. ISTORIA : Jurnal Pendidikan Dan Ilmu Sejarah 14 (2). https://doi.org/10.21831/istoria.v14i2.21919.