Dantic MJP. Development and Validation of Instructional Material in Astronomy. Int. J. Multidiscip. Appl. Bus. Edu. Res. [Internet]. 2023 Jan. 16 [cited 2026 Jan. 24];4(1):19-26. Available from: https://ijmaberjournal.org/index.php/ijmaber/article/view/36