Cita APA (7a ed.)

Preston, P. (1999). Comrades!: Portraits from the Spanish Civil War. HarperCollins.

Cita Chicago Style (17a ed.)

Preston, Paul. Comrades!: Portraits from the Spanish Civil War. London: HarperCollins, 1999.

Cita MLA (9a ed.)

Preston, Paul. Comrades!: Portraits from the Spanish Civil War. HarperCollins, 1999.