Pongvarut, Jirayu. “Graphic Design of Poster for The Japan World Exposition, Osaka 1970”. Silpa Bhirasri (Journal of fine arts) 9, no. 1 (June 30, 2021). accessed February 9, 2025. https://so02.tci-thaijo.org/index.php/jfa/article/view/249345.