Cita APA (7a ed.)

Barnes, I., & Barnes, P. (1996). The enlarged European Union. Longman.

Cita Chicago Style (17a ed.)

Barnes, Ian, y Pamela Barnes. The Enlarged European Union. London [etc.]: Longman, 1996.

Cita MLA (9a ed.)

Barnes, Ian, y Pamela Barnes. The Enlarged European Union. Longman, 1996.