Woeckl, Juergen, and Tanin Chaiyesh. “A Structural Equation Model for Spiritual Service Volunteer Labor Supply at Brahma Kumaris World Spiritual University”. Applied Economics Journal 21, no. 1 (May 20, 2016): 79–101. Accessed May 17, 2022. https://so01.tci-thaijo.org/index.php/AEJ/article/view/57238.