Khoiriyah, Riva, et al. “The Design and Validity of STEM-EDP-Gamification Worksheet: Ways to Improve Students’ Perception of Their STEM Skills and Motivation”. Jurnal Pendidikan Matematika Dan Sains, vol. 14, no. 1, Dec. 2025, pp. 92-106, doi:10.21831/jpms.v14i1.92031.