Tham khảo Schweizer_SGS_2-8

  1. Schweizer, Paul A: Wings Like Eagles, The Story of Soaring in the United States, pages 62-63. Smithsonian Institution Press, 1988. ISBN 0-87474-828-3
  2. Said, Bob: 1983 Sailplane Directory, Soaring Magazine, pages 26. Soaring Society of America, November 1983. USPS 499-920