Tophoven, R. (1985). GSG [neun] 9 German response to terrorism (2nd ed.). Bernard & Graefe.
Lua i Stíl Chicago (17ú heag.)Tophoven, Rolf. GSG [neun] 9 German Response to Terrorism. 2nd ed. Koblenz: Bernard & Graefe, 1985.
Lua MLA (8ú heag.)Tophoven, Rolf. GSG [neun] 9 German Response to Terrorism. 2nd ed. Bernard & Graefe, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.