Lua APA (7ú heag.)
Pennington, M. B. (1986). Centered living: The way of centering prayer. Doubleday.
Lua i Stíl Chicago (17ú heag.)
Pennington, M. Basil. Centered Living: The Way of Centering Prayer. Garden City, N.Y.: Doubleday, 1986.
Lua MLA (9ú heag.)
Pennington, M. Basil. Centered Living: The Way of Centering Prayer. Doubleday, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.