Gelpi, D. L. (1970). Discerning the spirit: Foundations and futures of religious life. Sheed and Ward.
Lua i Stíl Chicago (17ú heag.)Gelpi, Donald L. Discerning the Spirit: Foundations and Futures of Religious Life. New York: Sheed and Ward, 1970.
Lua MLA (8ú heag.)Gelpi, Donald L. Discerning the Spirit: Foundations and Futures of Religious Life. Sheed and Ward, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.