U.S. Navy Supervisor of Diving (2008). U.S. Navy Diving Manual(PDF). SS521-AG-PRO-010, revision 6. Vol. 5. U.S. Naval Sea Systems Command. pp. 20–25. Archived from the original(PDF) on 5 March 2011. Retrieved 28 July 2014.
web.archive.org
U.S. Navy Supervisor of Diving (2008). U.S. Navy Diving Manual(PDF). SS521-AG-PRO-010, revision 6. Vol. 5. U.S. Naval Sea Systems Command. pp. 20–25. Archived from the original(PDF) on 5 March 2011. Retrieved 28 July 2014.