Cox, J. (2007). Step by step 2007 Microsoft Office System. Redmond, WA: Microsoft Press.
Dyfyniad Arddull ChicagoCox, Joyce. Step By Step 2007 Microsoft Office System. Redmond, WA: Microsoft Press, 2007.
Dyfyniad MLACox, Joyce. Step By Step 2007 Microsoft Office System. Redmond, WA: Microsoft Press, 2007.
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