Foster, R. J. (1989). Celebration of discipline: The path to spiritual growth: 25th anniversary edition. Harper San Francisco.
Lua i Stíl Chicago (17ú heag.)Foster, Richard J. Celebration of Discipline: The Path to Spiritual Growth: 25th Anniversary Edition. New York: Harper San Francisco, 1989.
Lua MLA (9ú heag.)Foster, Richard J. Celebration of Discipline: The Path to Spiritual Growth: 25th Anniversary Edition. Harper San Francisco, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.