Harrington Aviation Museum (u.d.). «Carpetbagger Aviation Museum Harrington - The 801st / 492nd Bomb Group». Harrington Aviation Museum. Besøkt 19. november 2019. «Whilst the Americans were acquiring know-how from British airmen, RAF experts gave advice on the modifications necessary to the B-24 Liberators to be used. The B-24 was ideal for supply operations, the capacious fuselage and long range made it the envy of the RAF fliers. Nevertheless, many modifications were needed for its new task.»
lokalhistoriewiki.no
Stig Rune Pedersen (27.01.2014). «Oskar Hasselknippe». Norsk lokalhistorie-wiki. Besøkt 01.11.2017.
