Sri Rizki Sianturi, A., Retnoningsih, A. and Ridlo, S. 2021. Development of Interactive E-Book of Ferns Materials Through a Scientific Approach With HOTS Problems to Improve Student Learning Outcomes. Journal of Innovative Science Education. 10, 3 (Dec. 2021), 230-236. DOI:https://doi.org/10.15294/jise.v10i1.43091.