Foster, R. J. (1989). Celebration of discipline: The path to spiritual growth: 25th anniversary edition. Harper San Francisco.
Chicago-Zitierstil (17. Ausg.)Foster, Richard J. Celebration of Discipline: The Path to Spiritual Growth: 25th Anniversary Edition. New York: Harper San Francisco, 1989.
MLA-Zitierstil (9. Ausg.)Foster, Richard J. Celebration of Discipline: The Path to Spiritual Growth: 25th Anniversary Edition. Harper San Francisco, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.