Cita APA (7a ed.)

Greengrass, P. (2006). United 93. Universal Pictures Iberia.

Cita Chicago Style (17a ed.)

Greengrass, Paul. United 93. Madrid: Universal Pictures Iberia, 2006.

Cita MLA (9a ed.)

Greengrass, Paul. United 93. Universal Pictures Iberia, 2006.