Hopkins, Giles. “Politics and Karate: Historical Influences on the Practice of Goju-ryu”. Revista de Artes Marciales Asiáticas 2, no. 4 (July 18, 2012): 54–73. Accessed January 9, 2025. https://revpubli.unileon.es/ojs/index.php/artesmarciales/article/view/333.