Cita APA (7th ed.)

Williams, R. (2011). Barcelona & Catalonia. Dorling Kindersley Limited.

Cita Chicago (17th ed.)

Williams, Roger. Barcelona & Catalonia. London: Dorling Kindersley Limited, 2011.

Cita MLA (9th ed.)

Williams, Roger. Barcelona & Catalonia. Dorling Kindersley Limited, 2011.