APA (7 वां संस्करण) प्रशस्ति पत्र

Hughes, G., & Bucknall, J. (2000). Poland: Complying with EU environmental legislation. World Bank.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Hughes, Gordon, और Julia Bucknall. Poland: Complying with EU Environmental Legislation. Washington, D.C: World Bank, 2000.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Hughes, Gordon, और Julia Bucknall. Poland: Complying with EU Environmental Legislation. World Bank, 2000.