Johnston, R., & Johnston, R. (2001). Service operations managementRobert Johnston, Graham Clark. Prentice Hall.
Čikaški stil citiranja (17. izdanje)Johnston, Robert, i Robert Johnston. Service Operations ManagementRobert Johnston, Graham Clark. Prentice Hall, 2001.
MLA način citiranja (8. izdanje)Johnston, Robert, i Robert Johnston. Service Operations ManagementRobert Johnston, Graham Clark. Prentice Hall, 2001.
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