Maps.com (Firm) & ebrary, Inc. (2000). Expansion of railroads to 1860. Maps.com.
Chicagoスタイル(17版)引用形式Maps.com (Firm) , Inc ebrary. Expansion of Railroads to 1860. [S.l.]: Maps.com, 2000.
MLA(9版)引用形式Maps.com (Firm) , Inc ebrary. Expansion of Railroads to 1860. Maps.com, 2000.
警告: この引用は必ずしも正確ではありません.