Cita APA (7a ed.)

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.