Cilindros de acción simple y doble (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Cilindros de acción simple y doble" in Spanish language version.

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archive.org

Hawkins, Nehemiah (1897). New Catechism of the Steam Engine. New York: Theo Audel. pp. 110–113.

books.google.com

Smith, Edgar C. (2013). A Short History of Naval and Marine Engineering. Cambridge University Press. pp. 334-336. ISBN 9781107672932.
"Amazing Airplane Motor Doubles The Power", Popular Mechanics, Septiembre de 1932 cutaway drawing of double action aircraft engine