Gale Group. (2016). Worldmark encyclopedia of the states (Eighth edition.). Gale, Cengage Learning.
Chicago-referens (17:e uppl.)Gale Group. Worldmark Encyclopedia of the States. Eighth edition. Farmington Hills, Michigan: Gale, Cengage Learning, 2016.
MLA-referens (9:e uppl.)Gale Group. Worldmark Encyclopedia of the States. Eighth edition. Gale, Cengage Learning, 2016.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.