"Space" is our product. // Aviation Week & Space Technology, June 17, 1963, v. 78, no. 24, pp. 127.
اطلع عليه بتاريخ 27 أغسطس 2008.  "Space" is our product. // Aviation Week & Space Technology, June 17, 1963, v. 78, no. 24, pp. 127.