Royal Air Force Bomber Command Losses of the Second World War Volume 6 1945 (W.R. Chorley ISBN 0 904597 92 X 1998)
Britain’s Aviation Memorials and Mementoes (1992) David J.Smith, Patrick Stephens Ltd.; ISBN 1 85260 395 X
P/Off. McMullen is remembered at Darlington on D40.065 D40.068 and D40.096
Canadian Virtual War Memorial
The CWGC entry for Pilot Officer McMullen