Schaeffer, F. A. (1971). True spirituality. Tyndale.
Lua i Stíl Chicago (17ú heag.)Schaeffer, Francis A. True Spirituality. Wheaton: Tyndale, 1971.
Lua MLA (9ú heag.)Schaeffer, Francis A. True Spirituality. Tyndale, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.