1. Fluid Mechanics;Kundu,2004
2. The Oxford Dictionary of the World;Munro,1995
3. Piped-in Oxygen Serves High-Level Hotel, Lodging Hospitality, January, 2002.
4. Code of Federal Regulations. Title 14, Part 25.841. US Government Printing Office, Washington, DC, 1986.
5. K. Lange, A. Perka, B. Duffield, F. Jeng, NASA/CR-2005-213689, NASA Johnson Spaceflight Center, 2005.