Osteen, J. (2007). Become a better you: 7 keys to improving your life everyday. Free press.
Παραπομπή Chicago StyleOsteen, Joel. Become a Better You: 7 Keys to Improving Your Life Everyday. New York: Free press, 2007.
Παραπομπή MLAOsteen, Joel. Become a Better You: 7 Keys to Improving Your Life Everyday. Free press, 2007.
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