จิตวารินทร์ ธ. “The Development of the Instructional Package of Science for Life Subject With Emphasis the Processing of Local Agricultural Production Learning Unit 2: Scientific Method and Problem Solving for Phang-Nga Community College’s Diploma Students”. Parichart Journal, vol. 30, no. 3, Oct. 2017, pp. 1-8, https://so05.tci-thaijo.org/index.php/parichartjournal/article/view/101044.