Johnston, R., Clark, G., & Shulver, M. (2012). Service operations management: Improving service delivery (Fourth edition.). Pearson.

Johnston, Robert, Graham Clark, and Michael Shulver. Service Operations Management: Improving Service Delivery. Fourth edition. Harlow, Essex, England ; New York: Pearson, 2012.

Johnston, Robert, et al. Service Operations Management: Improving Service Delivery. Fourth edition. Pearson, 2012.