Maps.com (Firm) & ebrary, Inc. (1999). U.S. population change, 1950-1970. Maps.com.
Lua i Stíl Chicago (17ú heag.)Maps.com (Firm) agus Inc ebrary. U.S. Population Change, 1950-1970. [S.l.]: Maps.com, 1999.
Lua MLA (9ú heag.)Maps.com (Firm) agus Inc ebrary. U.S. Population Change, 1950-1970. Maps.com, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.