Jeffrey, G. R. (1988). Armageddon ; Appointment whit destiny. Frontier Research.
Lua i Stíl Chicago (17ú heag.)Jeffrey, Grant R. Armageddon ; Appointment Whit Destiny. Ontario: Frontier Research, 1988.
Lua MLA (9ú heag.)Jeffrey, Grant R. Armageddon ; Appointment Whit Destiny. Frontier Research, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.