Here are links to some important laws regarding business organizations for Illinois attorneys. The title links are to the free ILGA website.
Illinois Compiled Statutes
Business Organizations (805 ILCS 5/ et seq.) Westlaw, Lexis
General Not For Profit Corporation Act (805 ILCS 105/ et seq.) Westlaw, Lexis
Commercial Code (810 ILCS 5/ et seq.) Westlaw, Lexis
Business Transactions (815 ILCS 5/ et seq.) Westlaw, Lexis