APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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