Vanno, V., Kaemkate, W., & Wongwanich, S. (2016). Development and validation of the measurement model of group-level positive psychological capital: Composing group-level variables from individual-level data using data aggregation models. Kasetsart Journal of Social Sciences, 37(1), 99–110. retrieved from https://so04.tci-thaijo.org/index.php/kjss/article/view/242835