"Chapter 1 Universal Standards and Procedures", CMAS International Diver Training Standards and Procedures Manual, Confédération Mondiale des Activités Subaquatiques, pp. 2–3, retrieved 28 January 2013
Canadian agencies membership list of WRSTC "WRSTC Member Councils". Archived from the original on 2 October 2013. Retrieved 11 December 2012. retrieved 26 September 2013
"YMCA Scuba". Young Men’s Christian Association (YMCA) of the USA. 30 October 2008. Archived from the original on 30 October 2008. Retrieved 20 June 2015.
Canadian agencies membership list of WRSTC "WRSTC Member Councils". Archived from the original on 2 October 2013. Retrieved 11 December 2012. retrieved 26 September 2013
"YMCA Scuba". Young Men’s Christian Association (YMCA) of the USA. 30 October 2008. Archived from the original on 30 October 2008. Retrieved 20 June 2015.