These are some sources I've found especially useful for the Wars of the Roses
and for some of the major historical figures of this period:
C. A. J. Armstrong, trans., The Usurpation of Richard the Third. (Dominic Mancini)
Oxford, Clarendon Press, 1969.
David Baldwin, Elizabeth Woodville: Mother of the Princes in the Tower. Gloucestershire: Sutton, 2004
(paperback edition).
David Baldwin, The Kingmaker's Sisters: Six Powerful Women in the Wars of the Roses.
Gloucestershire: The History Press, 2009.
S. B. Chrimes, Henry VII. New Haven: Yale University Press, 1999.
Mary Clive, This Son of York: A Biography of Edward IV. New York: Knopf, 1974.
Anne Crawford, ed., Letters of the Queens of England, 1100–1547. Gloucestershire: Sutton, 2002 (paperback edition).
Anne Crawford, The Yorkists: The History of a Dynasty. London and New York: Hambledon, 2007.
Louise Gill, Richard III and Buckingham’s Rebellion. Gloucestershire: Sutton, 2000.
John Gillingham, The Wars of the Roses. Baton Rouge: Louisiana State University Press, 1981.
R. A. Griffiths, The Reign of King Henry VI. Gloucestershire: Sutton, 2004 (paperback edition).
Michael Hicks, Edward V: The Prince in the Tower. Gloucestershire: Tempus, 2003.
Michael Hicks, False, Fleeting, Perjur’d Clarence: George, Duke of Clarence 1449-78. Gloucester: Sutton, 1980.
Michael Hicks, The Wars of the Roses. New Haven and London: Yale University Press, 2010.
Michael Hicks, Warwick the Kingmaker. Oxford: Blackwell, 2002 (paperback edition).
Rosemary Horrox, Richard III: A Study in Service. Cambridge: Cambridge University Press, 1991.
Michael K. Jones and Malcolm G. Underwood, The King’s Mother: Lady Margaret Beaufort, Countess of Richmond
and Derby. Cambridge: Cambridge University Press, 1995.
J. R. Lander, Crown and Nobility 1450–1509. Montreal: McGill-Queen’s University Press, 1976.
J. L. Laynesmith, The Last Medieval Queens. Oxford: Oxford University Press, 2005 (paperback edition).
Helen Maurer, Margaret of Anjou: Queenship and Power in Late Medieval England. Woodbridge: The Boydell Press, 2003.
A. R. Myers, “The Household of Queen Elizabeth Woodville, 1466–7.” Bulletin of the John Rylands Library, 1967–68.
Arlene Okerlund, Elizabeth: England’s Slandered Queen. Gloucestershire: Tempus, 2006 (paperback edition).
Arlene Naylor Okerlund, Elizabeth of York. London: Palgrave Macmillan, 2009. A. J. Pollard, Richard III and the Princes in the Tower. Gloucestershire: Sutton, 2002 (paperback reprint).
Nicholas Pronay and John Cox, eds., The Crowland Chronicle Continuations: 1459–1486. London: Richard III and Yorkist History Trust, 1986.
Carole Rawcliffe, The Staffords, Earls of Stafford and Dukes of Buckingham 1394–1521. Cambridge: Cambridge University Press, 1978.
Charles Ross, Edward IV. New Haven and London: Yale University Press, 1997.
Charles Ross, Richard III. Berkeley and Los Angeles: University of California Press, 1981.
Cora Scofield, The Life and Reign of Edward IV. London: Longmans, Green and Co., 1923 (2 volumes).
George Smith, The Coronation of Elizabeth Wydeville. Gloucester: Gloucester Reprints, 1975 (originally published 1935).
Anne Sutton and Livia Visser-Fuchs, "A 'Most Benevolent Queen': Queen Elizabeth Woodville's Reputation, Her Piety and Her Books." The Ricardian, 1995.
Grant Uden, The Knight and the Merchant. New York: Roy Publishers, Inc. (no date). Deals with Anthony Woodville and William Caxton, whose printing business he patronized.
Christopher Wilkins, The Last Knight Errant: Sir Edward Woodville and the Age of Chivalry. London: I. B. Tauris, 2010.