Hultgren. Border Walls Gone Green. University of Minnesota Press.
Lua i Stíl Chicago (17ú heag.)Hultgren. Border Walls Gone Green. University of Minnesota Press.
Lua MLA (8ú heag.)Hultgren. Border Walls Gone Green. University of Minnesota Press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.