Heigl, A. (2001). Demographic Fact Book.
Lua i Stíl Chicago (17ú heag.)Heigl, Andreas. Demographic Fact Book. München, 2001.
Lua MLA (8ú heag.)Heigl, Andreas. Demographic Fact Book. 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.