Howson, G. (1990). Aircraft of the Spanish Civil War, 1936-39. Putnam.
Cita Chicago Style (17a ed.)Howson, Gerald. Aircraft of the Spanish Civil War, 1936-39. London: Putnam, 1990.
Cita MLA (9a ed.)Howson, Gerald. Aircraft of the Spanish Civil War, 1936-39. Putnam, 1990.
Precaución: Estas citas no son 100% exactas.