Trinh, T. P. T. ., Pham, T. V. ., Cao, H. T. ., Nguyen, T.-T. ., Nghiem, T. T. . and Tran, T. . (2019) “The Profile of Professional Standards for Secondary School Principals in Vietnam”, International Journal of Education and Practice, 7(4), pp. 310–323. doi: 10.18488/journal.61.2019.74.310.323.