Powell, C. H. (1958). Secrets of answered prayer. Thomas y Crowell.
Lua i Stíl Chicago (17ú heag.)Powell, Cyril H. Secrets of Answered Prayer. Thomas y Crowell, 1958.
Lua MLA (9ú heag.)Powell, Cyril H. Secrets of Answered Prayer. Thomas y Crowell, 1958.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.