KEOMOUNGKHOUN, D. “Development of Cooperative Learning (STAD) to Enhance Learning Achievement on Integer Calculations for Grade 7 Students at the Demonstration Secondary School of Savannakhet Teacher Training Collegeions for Grade 7 Students at the Demonstration Secondary School of Savannakhet Teacher Training College”. Souphanouvong University Journal Multidisciplinary Research and Development, vol. 12, no. Fast Track, Feb. 2026, pp. 01-06, doi:10.69692/SUJMRD12(Fast track)01.