Cita APA (7a ed.)

Maps.com (Firm). (1999). U.S. population change, 1970-1980. Maps.com.

Cita Chicago Style (17a ed.)

Maps.com (Firm). U.S. Population Change, 1970-1980. [Place of publication not identified]: Maps.com, 1999.

Cita MLA (8a ed.)

Maps.com (Firm). U.S. Population Change, 1970-1980. Maps.com, 1999.