Ratana-Ubol, Archanya, Suwithida Charungkaittikul, and Ravee Sajjasophon. 2015. “The Scenario of the University of the Third Age Models for Lifelong Learning of the Thai Aging Groups”. Kasetsart Journal of Social Sciences 36 (1):88-96. https://so04.tci-thaijo.org/index.php/kjss/article/view/243107.