VENTRELLA.S.W. (2001). THE POWER OF POSITIVE THINKING. VERMILION.
Cita Chicago (17th ed.)VENTRELLA.S.W. THE POWER OF POSITIVE THINKING. LONDON: VERMILION, 2001.
Cita MLA (9th ed.)VENTRELLA.S.W. THE POWER OF POSITIVE THINKING. VERMILION, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.