APA (7th ed.) Citation
Willard, D. (1991). The spirit of the disciplines: Understanding how God changes lives. Harper.
Chicago Style (17th ed.) Citation
Willard, Dallas. The Spirit of the Disciplines: Understanding How God Changes Lives. San Francisco: Harper, 1991.
MLA (9th ed.) Citation
Willard, Dallas. The Spirit of the Disciplines: Understanding How God Changes Lives. Harper, 1991.
Warning: These citations may not always be 100% accurate.