Johnston, R., & Johnston, R. (2001). Service operations managementRobert Johnston, Graham Clark. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Johnston, Robert, agus Robert Johnston. Service Operations ManagementRobert Johnston, Graham Clark. Prentice Hall, 2001.
Lua MLA (8ú heag.)Johnston, Robert, agus Robert Johnston. Service Operations ManagementRobert Johnston, Graham Clark. Prentice Hall, 2001.
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