Cita APA (7a ed.)

Barnes, P. M., & Barnes, I. (1999). Environmental policy in the European Union. Edward Elgar.

Cita Chicago Style (17a ed.)

Barnes, Pamela M., y Ian Barnes. Environmental Policy in the European Union. Cheltenham ; Northampton, MA: Edward Elgar, 1999.

Cita MLA (9a ed.)

Barnes, Pamela M., y Ian Barnes. Environmental Policy in the European Union. Edward Elgar, 1999.