Luchtalarm / Pieter van Wijngaarden, Prudent Staal 320 Squadron R.A.F. : memorial 1940-1945 / Jan P. Kloos dutch profile books Hudson : No. 320 Squadron Royal Netherlands, Naval Air Service RAF / Nico Geldhof, Coen van den Heuvel, Luuk Boerman dutch profile books Mitchell Mosquito : No. 320 Squadron Royal Neth. Naval Air Service RAF 1942-1946 / Nico Geldhof, Gerrit-Jan van den Berg, Luuk Boerman
