Vallen, J. J. (1985). Check in check out: Principles of effective front office management (3rd ed.). Wm.C. Brown.
Citace podle Chicago (17th ed.)Vallen, Jerome J. Check in Check Out: Principles of Effective Front Office Management. 3rd ed. Dubuque, Iowa: Wm.C. Brown, 1985.
Citace podle MLA (9th ed.)Vallen, Jerome J. Check in Check Out: Principles of Effective Front Office Management. 3rd ed. Wm.C. Brown, 1985.
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