<Li> Horace Walpole--Historic Doubts on the Life and Reign of Richard III (1768) </Li> <Li> Markham, Clements (1906). Richard III: His Life and Character . </Li> <Li> Audrey Williamson--The Mystery of the Princes (1978) </Li> <Li> Giles St. Aubyn--The Year of Three Kings, 1483 (Atheneum, 1983) </Li>

Who were the princes in the tower and what happened to them