Pinjai , C., P. Thungjaroenkul, and T. . . Supamanee. “Head Nurses’ Transformational Leadership and Registered Nurses’ Voice Behaviors, University Hospitals, Northern Region”. Nursing Journal CMU, vol. 47, no. 1, Mar. 2020, pp. 313-2, https://he02.tci-thaijo.org/index.php/cmunursing/article/view/240758.