VRIES, M. A. D. (1995). Professional Secretary's Encyclopedic Dictionary. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)VRIES, Mary A. De. Professional Secretary's Encyclopedic Dictionary. Prentice Hall, 1995.
Lua MLA (8ú heag.)VRIES, Mary A. De. Professional Secretary's Encyclopedic Dictionary. Prentice Hall, 1995.
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