U. Ulpiana, I. K. Werdhiana, and U. Wahyono, “The Influence of Problem-based Learning Models Assited by Open-ended Worksheet on Problem Solving Ability and Ability to Ask of Junior High School Student”, Int. J. Educ. Hum. Soc. Stud., vol. 1, no. 1, pp. 12–16, Mar. 2024, doi: 10.63895/j30321271.2024.v1.i1.pp12-16.