Bontje, M., & Burdack, J. (2005). Economic poles in the European metropolitan periphery and sustainable development. Leibniz-Inst. für Länderkunde.
Lua i Stíl Chicago (17ú heag.)Bontje, Marco, agus Joachim Burdack. Economic Poles in the European Metropolitan Periphery and Sustainable Development. Leipzig: Leibniz-Inst. für Länderkunde, 2005.
Lua MLA (8ú heag.)Bontje, Marco, agus Joachim Burdack. Economic Poles in the European Metropolitan Periphery and Sustainable Development. Leibniz-Inst. für Länderkunde, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.