Tyson, K. W. (1997). Competition in the 21st century. St. Lucie Press.
Lua i Stíl Chicago (17ú heag.)Tyson, Kirk W.M. Competition in the 21st Century. Delray Beach, FL: St. Lucie Press, 1997.
Lua MLA (9ú heag.)Tyson, Kirk W.M. Competition in the 21st Century. St. Lucie Press, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.