Kokaridas, Dimitrios, and Johan Lambeck. “The Halliwick Concept: Toward A Collaborative Aquatic Approach”. Inquiries in Physical Education and Sport 13, no. 2 (October 31, 2015): 65–76. Accessed July 22, 2024. https://journals.lib.uth.gr/index.php/inquiries/article/view/1456.