Curtis, D. (1961). Your thoughts can change your life. Wilshire Book Co.
Cita Chicago (17th ed.)Curtis, Donald. Your Thoughts Can Change Your Life. 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.