Rumino, R. (2022) “Improving Teacher Ability in Preparing HOTS Questions Through In-House Training (IHT) at Ngaliyan State Elementary School, Samigaluh, Kulon Progo Regency for the 2021/2022 Academic Year”, IJCER (International Journal of Chemistry Education Research), 6(2), pp. 147–152. doi: 10.20885/ijcer.vol6.iss2.art13.