Degree of commitment of science books in the Hashemite Kingdom of Jordan to the basic stage in grades (4-6) of the Brunner spiral model in curriculum design in plant subjects. JEPS [Internet]. 2019 Jan. 30 [cited 2024 May 19];3(1):79-65. Available from: https://journals.ajsrp.com/index.php/jeps/article/view/437