1. National Aeronautics and Space Administration (NASA) 〈http://www.nasa.gov〉
2. Russian Federal Space Agency (ROSCOSMOS) 〈http://www.roscosmos.ru〉
3. European Space Agency (ESA) 〈http://www.esa.int〉
4. Japan Aerospace Exploration Agency (JAXA) 〈http://www.jaxa.jp〉
5. International Space Station Program, Generic on-orbit stowage capabilities and requirements: pressurized volume. SSP 50621, Revision E, 2006.