Tophoven, R. (1985). GSG [neun] 9 German response to terrorism (2nd ed.). Bernard & Graefe.
Chicago-referens (17:e uppl.)Tophoven, Rolf. GSG [neun] 9 German Response to Terrorism. 2nd ed. Koblenz: Bernard & Graefe, 1985.
MLA-referens (8:e uppl.)Tophoven, Rolf. GSG [neun] 9 German Response to Terrorism. 2nd ed. Bernard & Graefe, 1985.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.