“THE EFFECTS OF SCHOENFELD PROBLEM-SOLVING  INSTRUCTIONAL  STRATEGY ON PERFORMANCE  OF  SENIOR  SECONDARY II  STUDENTS  IN  MATHEMATICS IN GOMBE STATE, NIGERIA”, DMJN, Apr. 2025, Accessed: Feb. 05, 2026. [Online]. Available: https://gagdm.com/index.php/DELSULIBRARYNIGERIA/article/view/155