Cita APA (7th ed.)
Maps.com (Firm) & ebrary, Inc. (2000). World War I in Europe. Maps.com.
Cita Chicago (17th ed.)
Maps.com (Firm) i Inc ebrary. World War I in Europe. [S.l.]: Maps.com, 2000.
Cita MLA (9th ed.)
Maps.com (Firm) i Inc ebrary. World War I in Europe. Maps.com, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.