Lewis, H. W. (1990). Technological risk. W.W. Norton.
Lua i Stíl Chicago (17ú heag.)Lewis, H. W. Technological Risk. New York: W.W. Norton, 1990.
Lua MLA (8ú heag.)Lewis, H. W. Technological Risk. W.W. Norton, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.