"
THE FLIGHT OF APOLLO-SOYUZ." National Aeronautics and Space Administration. Accessed June 26, 2015. http://history.nasa.gov/apollo/apsoyhist.html.
"
The Apollo-Soyuz Mission." National Aeronautics and Space Administration. Accessed June 26, 2015. https://www.nasa.gov/mission_pages/apollo-soyuz/astp_mission.html.