Ratajczak, Jakub, Mikołaj Wieczorek, and Grzegorz Rutkowski. “Analysis of Recreational Diving Training According to the CMAS International Diving Confederations, SSI Diving School System and American NAUI and PADI Associations”. Scientific Journal of Gdynia Maritime University, no. 125 (March 31, 2023): 40–53. Accessed November 21, 2024. https://sjgmu.umg.edu.pl/index.php/sjgmu/article/view/301.