The following resources address the laws of businesses and non-profits and can assist with entity formation other activities.
Practice Centers
Treatises
The Law of Tax-Exempt Organizations (Wiley ebook)
Nonprofit Organizations: Law & Taxation (Westlaw)
Folk on the Delaware General Corporation Law (Wolters Kluwer)
Delaware Law of Corporations and Business Organizations (Westlaw)
Blumberg on Corporate Groups (Wolters Kluwer)
Practice Materials
Advising Oregon Businesses (BarBooks)
Washington Partnership and LLC Deskbook (Casemaker)
Advising Small Businesses (Westlaw)
Corporate Practice Series (Bloomberg Law)
Choice of Entity, Legal Considerations of Selection, Portfolio 50-4th
Limited Liability Companies: Legal Aspects of Organization, Operation, and Dissolution, Portfolio 67-2nd
Forms
Nonprofit Corporation Forms Handbook (Westlaw)
Corporation Forms (Westlaw)
Hornbooks
Corporation Law by Franklin Gevurtz
The Law of Corporations in a Nutshell, by Robert W. Hamilton & Richard D. Freer