K. Pimjai, S. Aupparee, Y. Loppanthong, and D. Thawinkarn, “Guidelines for Developing the Human Relations Skills of New School Principals in Khon Kaen Province”, EDUCU, vol. 49, no. 4, p. EDUCU4904003 (11 pages) doi: 10.14456/educu.2021.62, Dec. 2021.