What we have discovered about the Cold War is what we already knew : Julius Mader and the Western secret services during the Cold War

Maddrell, John, 'What we have discovered about the Cold War is what we already knew: Julius Mader and Western Espionage during the Cold War', Cold War History (2005) 5(2) pp.235-258 RAE2008

Meibion Afradlon a Chymeriadau Eraill: Golwg ar y Dymer Delynegol, 1891-1940

Chapman, T. (2004). Meibion Afradlon a Chymeriadau Eraill: Golwg ar y Dymer Delynegol, 1891-1940. Caerdydd: Gwasg Prifysgol Cymru.