Day, Dwayne A. (2003). "Composites and Advanced Materials". NASA. U.S. Centennial of Flight Commission. Archived from the original(Centennial of Flight Commemoration Act Public Law 105-389 105th Congress (November 13, 1998)) on 2010-05-28. Retrieved 2010-06-05. Public domain content (see above reference)
Day, Dwayne A. (2003). "Composites and Advanced Materials". NASA. U.S. Centennial of Flight Commission. Archived from the original(Centennial of Flight Commemoration Act Public Law 105-389 105th Congress (November 13, 1998)) on 2010-05-28. Retrieved 2010-06-05. Public domain content (see above reference)