- Official Duke Ellington website: http://www.dukeellington.com
- Official Billy Strayhorn website : https://billystrayhorn.com
- Ellington on the Web: http://ellingtonweb.ca/
- Duke on the Web: http://dukeontheweb.com/index.htm
- Ellington Galaxy: https://ellingtongalaxy.org
- Duke Ellington at the Smithsonian (overview): https://music.si.edu/story/duke-ellington-smithsonian
- Ellington in the Smithsonian. Illustrated holdings: https://www.si.edu/spotlight/duke-ellington
- Guide to the Smithsonian’s Duke Ellington Collection: https://sova.si.edu/record/NMAH.AC.0301
- Robust Ellington discography: https://ellingtonia.com/
- Ellington 78 rpm discography (partial): https://adp.library.ucsb.edu/index.php/mastertalent/detail/102155/Ellington_Duke
- The Duke—Where and When. A chronicle of Ellington’s working life and travels: http://tdwaw.ca/TDWAW1.html