Cita APA (7th ed.)
Fritz, R. (2008). The power of a positive attitude: Discovering the key to success. American Management Association.
Cita Chicago (17th ed.)
Fritz, Roger. The Power of a Positive Attitude: Discovering the Key to Success. New York: American Management Association, 2008.
Cita MLA (9th ed.)
Fritz, Roger. The Power of a Positive Attitude: Discovering the Key to Success. American Management Association, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.