Wikimedia Commons has media related to Perales River (tributary of Alberche).
^"Perales River | the Internet Bird Collection | HBW Alive". www.hbw.com. Retrieved 2019-12-08.
^Cortada, James W. (2014-05-27). Modern Warfare in Spain: American Military Observations on the Spanish Civil War, 1936-1939. Potomac Books, Inc. ISBN 978-1-61234-101-9.