สุขสาธุ อ. and จงวิศาล ร. (2019) “Workplace Spirituality, Mindfulness, Work Engagement and Core Competency of First-line Managers in a Telecommunications Business Group”, Journal of HR intelligence, 14(2), pp. 66–83. available at: https://so03.tci-thaijo.org/index.php/hri/article/view/223610 (accessed: 13 September 2026).