Gavian, R. W., & Hamm, W. A. (1960). United States history. D.C. Heath.
Lua i Stíl Chicago (17ú heag.)Gavian, Ruth Wood, agus William Albert Hamm. United States History. Boston: D.C. Heath, 1960.
Lua MLA (8ú heag.)Gavian, Ruth Wood, agus William Albert Hamm. United States History. D.C. Heath, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.