Espinosa, A. A., Nueva España, R. C., & Marasigan, A. C. (2016). Investigating Pre-service Chemistry Teachers’ Problem Solving Strategies: Towards Developing a Framework in Teaching Stoichiometry. Journal of Education in Science, Environment and Health, 2(2), 104–124. Retrieved from https://jeseh.net/index.php/jeseh/article/view/22