Coombs is best known for his research on Winston Churchill's art work, publishing two books on the subject (1967 and 2003). He has been described as "the official authority on Churchill's art." He produced and later revivised a catalogue which brings together all of Churchill's 500 or so paintings and 2 sculptures, in which each piece has been given a number prefixed with the letter C for Coombs. This catalogue also exist in the form of a digital archive of the paintings. His 1967 catalogue was described as "an indispensable catalogue" of Churchill's art.
- Churchill: His Paintings, by David Coombs (1967)
- Sir Winston Churchill's Life Through His Paintings, by David Coombs with Minnie Churchill (2003)
- Sir Winston Churchill: His Life and His Paintings, by Minnie Churchill and David Coombs (2013)
- "Sir Winston Churchill painting to fetch £750,000". The Telegraph. June 14, 2012. Retrieved 26 January 2014.
- "The Artist Winston Churchill". National Churchill Museum. Retrieved 26 January 2014.
- Coombs, David (January 1, 1967). Churchill: His Paintings. Hamish Hamilton. ISBN 978-1299694712.
- "Sir Winston Churchill's life through his paintings / David Coombs with Minnie Churchill; foreword by Mary Soames". National Library of Australia. Retrieved 26 January 2014.
- Churchill, Minnie; Coombs, David (October 1, 2013). Sir Winston Churchill: His Life and His Paintings. Unicorn Press. ISBN 978-0956771513.
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