Krajewski, L. J., & Ritzman, L. P. (2005). Operations management: Processes and value chains (7th ed.). Pearson/Prentice Hall.

Krajewski, Lee J., and Larry P. Ritzman. Operations Management: Processes and Value Chains. 7th ed. Upper Saddle River, NJ; New Delhi: Pearson/Prentice Hall, 2005.

Krajewski, Lee J., and Larry P. Ritzman. Operations Management: Processes and Value Chains. 7th ed. Pearson/Prentice Hall, 2005.