Steffen, K. G. (1965). High energy. Inter-Science Publishing.
Lua i Stíl Chicago (17ú heag.)Steffen, Klaus G. High Energy. New York: Inter-Science Publishing, 1965.
Lua MLA (9ú heag.)Steffen, Klaus G. High Energy. Inter-Science Publishing, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.