Australian War Memorial (2008): «40652 Squadron Leader John Edwin Ashley Williams, DFC» Brodie, Ian (2006): «Squadron Leader John Edwin Ashley Williams». New Zealand Fighter Pilots Museum. Brown, Russell (2000): . Maryborough, Queensland, Australia: Banner Books. ISBN 1-875593-22-5. Herington, John (1954): (1. utg.). Canberra: Australian War Memorial. Sly, Edward «Ted» (2003): . Ballina NSW, Australia: Spitfire Books. ISBN 0-646-46314-4. Thomas, Andrew (2005): . Oxford, UK: Osprey Publications. ISBN 978-1-84176-083-4.