Curtis, D. (1961). Your thoughts can change your life. Wilshire Book Co.
Cita Chicago (17th ed.)Curtis, Donald. Your Thoughts Can Change Your Life. California: Wilshire Book Co, 1961.
Cita MLA (9th ed.)Curtis, Donald. Your Thoughts Can Change Your Life. Wilshire Book Co, 1961.
Atenció: Aquestes cites poden no estar 100% correctes.