Johnston, R. (2018). Service Operations Management: Improving Service Delivery (4th.). Pearson.
Lua i Stíl Chicago (17ú heag.)Johnston, Robert. Service Operations Management: Improving Service Delivery. 4th. Pearson, 2018.
Lua MLA (9ú heag.)Johnston, Robert. Service Operations Management: Improving Service Delivery. 4th. Pearson, 2018.
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