Zaitoon, E. H., & Majali, M. D. (2022). The Extent to which the Principles of Constructivist Theory are Represented in Biology Textbooks of the Ninth and Tenth Grades in Jordan: An Analytical Study. Journal of Educational and Psychological Sciences, 6(14), 128-151. https://doi.org/10.26389/AJSRP.R240921