Gennard, John Graham Judge. (2005). Employee Relations. London: The Chartered Institute of Personnel and Development.
Hollinshead, Graham, Peter Nicholls Stephanie Tailby. (2003). Employee Relations. Upper Saddle River, NJ: Prentice Hall.
Lewis, Philip, Adrian Thornhill Mark Saunders. (2003). Employee Relations. London: Financial Times/Prentice Hall.
Roger W. Griffeth and Peter W. Hom, (2001). Retaining Valued Employees, Sage Publications, Inc., Thousand Oaks, CA, p. 2.