Chantharattana, Weerawat. “The Development of Learning Achievement and Basic Research Skills by Using Instructional Package on Research for Development of Learning Innovation (Code 1043407-62) for 3rd year Student Teachers of Phetchaburi Rajabhat University”. Doctor of Philosophy in Social Sciences Journal 5, no. 2 (August 18, 2026): 149–166. accessed October 4, 2026. https://so08.tci-thaijo.org/index.php/dpssj/article/view/6588.