Alison Weir - Britain's Royal Families (which discusses the issue of her Kyme, Kymbe, or Keme children's possible survival)
Complete Peerage, volume 14 (1998), pg. 626 (sub Welles, for the first marriage of The Princess Cecily to Ralph Scrope)
J. L. Laynesmith, The Last Medieval Queens: English Queenship 1445-1503, 2004, pp. 199–200 (regarding the anger of King Henry VII at her final marriage and his confiscation of her estates, and the negotiations for a resolution and partial restoration of Princess Cecily's property by the King's mother, Margaret, Countess of Richmond and Derby)
Mary Anne Everett Green, Lives of the Princesses of England, vol. 3, chapter 13 (Cecilia Third Daughter of Edward IV), pp. 404–436
Macdougall, Norman, James III, A Political Study, John Donald (1982), for the Scottish marriage plans.
Rosemary Horrox, Richard III, A Study in Service, 1989, p. 295 (the basis of the claim in the Complete Peerage regarding Princess Cecily's first marriage to Scrope)
Stanley Frederick Hockey, Quarr Abbey and Its Lands, 1132-1631, 1977, University of Leicester Press, p. 61
