Zier, C. (2000). Binary black holes and Tori active galactic nuclei. Universität Bonn.
Lua i Stíl Chicago (17ú heag.)Zier, Christian. Binary Black Holes and Tori Active Galactic Nuclei. Germany: Universität Bonn, 2000.
Lua MLA (8ú heag.)Zier, Christian. Binary Black Holes and Tori Active Galactic Nuclei. Universität Bonn, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.