Trongtokit, Chayanuch, Orn-anong Wichaikhum, and Kulwadee Abhicharttibutra. 2020. “Situation Analysis of Nursing Supervision Among Unoff Icial-Time Nurse Supervisors, Operating Room, Buddhachinaraj Phitsanulok Hospital”. Nursing Journal CMU 47 (4):252-65. https://he02.tci-thaijo.org/index.php/cmunursing/article/view/247953.