Hughes, G., & Bucknall, J. (2000). Poland: Complying with EU environmental legislation. World Bank.
Παραπομπή σε μορφή Chicago (17η εκδ.)Hughes, Gordon, και Julia Bucknall. Poland: Complying with EU Environmental Legislation. Washington, D.C.: World Bank, 2000.
Παραπομπή σε μορφή MLA (9th εκδ.)Hughes, Gordon, και Julia Bucknall. Poland: Complying with EU Environmental Legislation. World Bank, 2000.