เกรียงไกรกุล พ., บุญปู่ ส., and ชัยสุข พ. “A STUDY OF DESIRABLE CHARACTERISTICS OF VOCATIONAL STUDENTS BASED ON FIVE PRECEPTS OF THE PATIPPLIPHOL TECHNOLOGY COLLEGE IN BANGKOK”. Mahamakut Graduate School Journal, vol. 19, no. 1, June 2021, p. 11, https://so04.tci-thaijo.org/index.php/mgsj/article/view/252393.