Jacobs, G. M., T. Helke, and W. A Renandya. “Explicit Inclusion of Thinking Skills in the Learning of Second Languages”. LEARN Journal: Language Education and Acquisition Research Network, vol. 11, no. 1, June 2018, pp. 15-25, https://so04.tci-thaijo.org/index.php/LEARN/article/view/135867.