«1941: Jewish Commando Dies on Mission for British in Iraq». Haaretz (på engelsk). 20. mai 2016. Besøkt 29. november 2023. «On May 20, 1941, David Raziel, commander of the Etzel – the Jewish underground militia in Palestine affiliated with Revisionist Zionism – was killed while leading a commando mission in Iraq for the British army.»
jewishvirtuallibrary.org
«Robert Bitker». www.jewishvirtuallibrary.org. Besøkt 29. november 2023.