APA-viite (7. p.)
Fritz, R. (2008). The power of a positive attitude: Discovering the key to success. American Management Association.
Chicago-viite (17. p.)
Fritz, Roger. The Power of a Positive Attitude: Discovering the Key to Success. New York: American Management Association, 2008.
MLA-viite (9. p.)
Fritz, Roger. The Power of a Positive Attitude: Discovering the Key to Success. American Management Association, 2008.
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