Krajewski, L. J., Ritzman, L. P., & Malhotra, M. K. (2011). Operations management: Processes and supply chains (9th ed.). Prentice Hall ; Pearson.

Krajewski, Lee J., Larry P. Ritzman, and Manoj K. Malhotra. Operations Management: Processes and Supply Chains. 9th ed. Upper Saddle River, N.J. : New Delhi: Prentice Hall ; Pearson, 2011.

Krajewski, Lee J., et al. Operations Management: Processes and Supply Chains. 9th ed. Prentice Hall ; Pearson, 2011.