Hi SPRITEtoo,
AFAIK you can't combine multiple citations within the one set of parentheses.
To cite a book section, open the 'Manage Sources' dialog box and, from the Sources dropdown, choose 'Book Section'. The 'Title' is the Section title. The 'Book title' is ... (you guessed it). You'll note that the 'Book Section' version of the dialog also provides for both 'Author' and 'Book Authour', in case the section & overall book have different authors.
See:
http://office.microsoft.com/en-us/wo...010368774.aspx