France, S. (2010). The definitive personal assistant and secrerarial handbook. Kogan Page.
Lua i Stíl Chicago (17ú heag.)France, Sue. The Definitive Personal Assistant and Secrerarial Handbook. New Delhi: Kogan Page, 2010.
Lua MLA (9ú heag.)France, Sue. The Definitive Personal Assistant and Secrerarial Handbook. Kogan Page, 2010.
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