A well-reviewed book you might want to look into is <A HREF="http://www.amazon.com/exec/obidos/ASIN/158115030X/102-3202682-2306509" TARGET="_blank">Business and Legal Forms for Graphic Designers</A>.
And, as an added bonus, here's a <A HREF="http://studio.adobe.com/resources/smallbusresources.html" TARGET="_blank">great designer resource site!</A>
Hope that helps!
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