Cita APA (7a ed.)

Maps.com (Firm) & ebrary, Inc. (2000). Expansion of railroads to 1860. Maps.com.

Cita Chicago Style (17a ed.)

Maps.com (Firm) y Inc ebrary. Expansion of Railroads to 1860. [S.l.]: Maps.com, 2000.

Cita MLA (9a ed.)

Maps.com (Firm) y Inc ebrary. Expansion of Railroads to 1860. Maps.com, 2000.