สิงห์จุ้ย อานนท์, and พุทธา สมชัย. 2018. “The Relationship Between Internal Supervision Process and Lesson Plan Management Skills of Suphanburi Technical College”. Journal of Humanities and Social Sciences, Rajapruk University 3 (3):130-42. https://so03.tci-thaijo.org/index.php/rpu/article/view/112633.