สุขสำราญ เ. (2018). The Effect of Using a Guidance Activities Package with Brainstorming Technique to Develop Creative Problem Solving Ability of Phathom Suksa II Students of Thessaban 4 ( Udomwitsomjai) School in Prachin Buri Province. STOU Education Journal, 11(2), 43–55. retrieved from https://so05.tci-thaijo.org/index.php/edjour_stou/article/view/160356