NOAA Diving Program (U.S.) (28 Feb 2001). Joiner, James T. (ed.). NOAA Diving Manual, Diving for Science and Technology (4th ed.). Silver Spring, Maryland: National Oceanic and Atmospheric Administration, Office of Oceanic and Atmospheric Research, National Undersea Research Program. ISBN978-0-941332-70-5. CD-ROM prepared and distributed by the National Technical Information Service (NTIS)in partnership with NOAA and Best Publishing Company
archive.today
Henderson, NC; Berry, WE; Eiber, RJ; Frink, DW (1970). "Investigation of scuba cylinder corrosion, Phase 1". National Underwater Accident Data Center Technical Report Number 1. University of Rhode Island. Archived from the original on April 15, 2013. Retrieved 2011-09-24.{{cite journal}}: CS1 maint: unfit URL (link)
austrian-standards.at
shop.austrian-standards.at
"Gas cylinders — Stamp marking". ISO 13769 (1st ed.). Geneva, Switzerland: International Standards Organisation. 1 July 2002. Retrieved 8 November 2016.