Collier, D. A. (1987). Service management: Operating decisions. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Collier, David A. Service Management: Operating Decisions. Englewood Cliffs N.J: Prentice-Hall, 1987.
Lua MLA (9ú heag.)Collier, David A. Service Management: Operating Decisions. Prentice-Hall, 1987.
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