DeCenzo, D. A., & Robbins, S. P. (1999). Human resource management (6th ed.). John Wiley & Sons.

DeCenzo, David A., and Stephen P. Robbins. Human Resource Management. 6th ed. New York: John Wiley & Sons, 1999.

DeCenzo, David A., and Stephen P. Robbins. Human Resource Management. 6th ed. John Wiley & Sons, 1999.