คงรอด จ. “Using the Jigsaw Technique to Improve Knowledge and Understanding of 4th Year Business Administration Students, Thaksin University, Marketing Planning Subject”. Parichart Journal, vol. 30, no. 3, Oct. 2017, pp. 9-14, https://so05.tci-thaijo.org/index.php/parichartjournal/article/view/101045.