Reck, R. (2013). The Engagement Formula. Westland Ltd.
Cita Chicago (17th ed.)Reck, Ross. The Engagement Formula. New Delhi: Westland Ltd, 2013.
Cita MLA (9th ed.)Reck, Ross. The Engagement Formula. Westland Ltd, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.