Stevens, H. (2009). Achieve Sales Excellence. Kogan Page India.
Cita Chicago (17th ed.)Stevens, Howard. Achieve Sales Excellence. New Delhi: Kogan Page India, 2009.
Cita MLA (9th ed.)Stevens, Howard. Achieve Sales Excellence. Kogan Page India, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.