ทองสรรค์ ต.; ศิริวงศ์ พ.; ไชยณรงค์ ป. A Development of Mathematics Problem – Solving Skill Packages on Permutation and Combination for Mathayom Suksa Five . Ubon Ratchathani Journal of Research and Evaluation, [S. l.], v. 3, n. 2, p. 97–102, 2021. Disponível em: https://so06.tci-thaijo.org/index.php/ubonreseva/article/view/250953. Acesso em: 3 oct. 2026.