Ucharattana, Prangtip, Tunyarat Augmekiat, Arunrat Khanta, and Tarinee Limpongsathorn. “Effect of Clinical Teaching Methods Using Portfolio and Knowledge Market on Self-Directed Learning of Students in Program of Nursing Specialty in Nursing Management”. Nursing Science Journal of Thailand 30, no. 4 (1): 18-27. Accessed January 30, 2020. https://www.tci-thaijo.org/index.php/ns/article/view/10519.