James Stuart Olson, Robert Shadle: Historical dictionary of European imperialism, s. 293. Greenwood Publishing Group, 1991. ISBN 9780313262579. Teoksen verkkoversio.
Wayne H. Bowen, José E. Álvarez: A military history of modern Spain: from the Napoleonic era to the international war on terror, s. 129. Greenwood Publishing Group, 2007. ISBN 9780275993573. Teoksen verkkoversio.