National Municipal League. (1952). A guide for charter commissions (2nd rev. ed.). National Municipal League.
Chicago-referens (17:e uppl.)National Municipal League. A Guide for Charter Commissions. 2nd rev. ed. New York: National Municipal League, 1952.
MLA-referens (9:e uppl.)National Municipal League. A Guide for Charter Commissions. 2nd rev. ed. National Municipal League, 1952.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.