Burke, J., and S. E. . O’Brien. “Heliotropic Leadership: An Examination of the Role That Psychological Capital Plays in Enhancing teachers’ Morale”. Journal of School and Educational Psychology, vol. 1, no. 1, Sept. 2021, pp. 17-25, https://www.journalofschoolpsychology.com/index.php/josep/article/view/7.