Pierson, R. H. (1966). The final countdown by Robert H Pierson and G S Stevenson. Pacific Press.
Lua i Stíl Chicago (17ú heag.)Pierson, Roberto H. The Final Countdown by Robert H Pierson and G S Stevenson. Pacific Press, 1966.
Lua MLA (9ú heag.)Pierson, Roberto H. The Final Countdown by Robert H Pierson and G S Stevenson. Pacific Press, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.