- Divorced, Beheaded, Survived; Karen Lindsay
- Six Wives; David Starkey
- Six Wives; Alison Weir
- Six Wives; Antonia Fraser
- Six Wives; David Loades
- Catherine Howard; David Loades
- Katherine Howard: A Tudor Conspiracy; Joanna Denny
- Catherine Howard: A Tudor Tragedy; Lacey Baldwin Smith
- Memoirs Of Henry The Eighth Of England With The Fortunes And Characters Of His Six Wives; Henry William Herbert
- Lives of the Queens of England, volume 4; Agnes (and Elisabeth) Strickland
I bolded the ones that I felt were essential reading, either because they presented new/interesting arguments or because they showed a specifically engaging view/interpretation or if they were simply v. sympathetic.
Hope these help!
Post submitted by shaestel, when I asked for some Katherine related book recommendations to bolster my collection. Published with her permission in case anyone else could use them too!