Maps.com (Firm) & ebrary, Inc. (1999). U.S. population change, 1970-1980. Maps.com.
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Dyfyniad Arddull Chicago
Maps.com (Firm) and Inc ebrary. U.S. Population Change, 1970-1980. [S.l.]: Maps.com, 1999.
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Dyfyniad MLA
Maps.com (Firm) and Inc ebrary. U.S. Population Change, 1970-1980. Maps.com, 1999.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.