Hughes, G., & Bucknall, J. (2000). Poland: Complying with EU environmental legislation. World Bank.
Chicago-viite (17. p.)Hughes, Gordon, ja Julia Bucknall. Poland: Complying with EU Environmental Legislation. Washington, D.C.: World Bank, 2000.
MLA-viite (9. p.)Hughes, Gordon, ja Julia Bucknall. Poland: Complying with EU Environmental Legislation. World Bank, 2000.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.