Zelazny, R. (1967). Four for tomorrow. Ace Books.
Lua i Stíl Chicago (17ú heag.)Zelazny, Roger. Four for Tomorrow. New York: Ace Books, 1967.
Lua MLA (9ú heag.)Zelazny, Roger. Four for Tomorrow. Ace Books, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.