Spangenberg and Beeman describe the structure and funding of the systems of delivery of legal services to indigent criminal defendents in use at the state level, including assigned counsel, contract attorneys and public defenders.
Robert L. Spangenberg & Marea L. Beeman,
Indigent Defense Systems in the United States,
58 Law and Contemporary Problems
Available at: http://scholarship.law.duke.edu/lcp/vol58/iss1/3