Foster, R. J. (1978). Celebration of discipline: The path to spiritual growth. Harper & Row.
Chicago-viite (17. p.)Foster, Richard J. Celebration of Discipline: The Path to Spiritual Growth. New York: Harper & Row, 1978.
MLA-viite (9. p.)Foster, Richard J. Celebration of Discipline: The Path to Spiritual Growth. Harper & Row, 1978.
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