Geisler, N. (1974). Philosophy of religion. Zondervan.
Lua i Stíl Chicago (17ú heag.)Geisler, Norman. Philosophy of Religion. Grand Rapids: Zondervan, 1974.
Lua MLA (9ú heag.)Geisler, Norman. Philosophy of Religion. Zondervan, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.