Sources:

• Al Blue on AM927.
• Al Blue on origin of LB designation. Also helped straighten out the problem with multiple designations for YB-24s.
• Al Blue on proposed secret flight over Japanese-held islands.
• American Combat Planes, 3rd Enlarged Edition, Ray Wagner, Doubleday, 1982.
• B-24 Liberator in Action, Larry Davis, Squadron/Signal Publications Inc, 1987.
• Bob Livingstone on AL516, AL517, AL510,
• Consolidated B-24D-M Liberator IN USAAF-RAF-RAAF-MLD-IAF-CzechAF and CNAF Service, Ernest R. McDowell, Arco, 1970.
• E-mail from Bob Redknap on loss of AL523.
• E-mail from Bob Tupa on history of nose turret installation.
• E-mail from Gordon Birkett on disposition of some LB-30s.
• E-mail from Greg Banfield on Qantas LB-30s.
• E-mail from John Anthony on duplicate applications of serial batch 40-2349/2368.
• E-mail from John Anthony on duplicate serial numbers for YB-24s.
• E-mail from Phil Marchese on 41-23765 being the first B-24D1.
• E-mail from Terence Leary on fates of LB-30s.
• Famous Bombers of the Second World War, William Green, Doubleday, 1959.
• General Dynamics Aircraft and Their Predecessors, John Wegg, Naval Institute Press, 1990.
• Jane's American Fighting Aircraft of the 20th Century, Michael J.H. Taylor, Mallard Press.
• Liberator: America's Global Bomber, Alwyn T. Lloyd, Pictorial Histories Publishing Co, Inc, 1993.
• Robert Livingstone on AL557
• United States Military Aircraft Since 1909, Gordon Swanborough and Peter M. Bowers, Smithsonian, 1989.
• Warplane Classic--Consolidated B-24 Liberator, Robert F. Dorr and Jon Lake, International Air Power Review, Spring 2002 on fates of AL533, AL535, AL567, AL572, AL576, AL609, AL612.