Murphy, J. (2007). Believe in yourself (1st Hay House ed.). Hay House.
Cita Chicago (17th ed.)Murphy, Joseph. Believe in Yourself. 1st Hay House ed. Carlsbad, Calif.: Hay House, 2007.
Cita MLA (9th ed.)Murphy, Joseph. Believe in Yourself. 1st Hay House ed. Hay House, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.