Maps.com (Firm) & ebrary, Inc. (1999). U.S. population change, 1950-1970. Maps.com.
Chicagoスタイル(17版)引用形式Maps.com (Firm) , Inc ebrary. U.S. Population Change, 1950-1970. [S.l.]: Maps.com, 1999.
MLA(9版)引用形式Maps.com (Firm) , Inc ebrary. U.S. Population Change, 1950-1970. Maps.com, 1999.
警告: この引用は必ずしも正確ではありません.