Rymaruk, Ihor. “Defending to the Four Directions Evolving Uechi-ryu’s Hojoundo Exercises for Advanced Students”. Revista de Artes Marciales Asiáticas 3, no. 1 (July 19, 2012): 80–91. Accessed February 3, 2023. https://revistas.unileon.es/ojs/index.php/artesmarciales/article/view/349.