"Canonical Implications of Richard III's Plan to Marry His Niece," Traditio 23 (1967) 269-311.

Divine Providence in the England of Shakespeare's Histories . Cambridge, Mass.: Harvard University Press, l970. Reprint, Eugene: Wipf and Stock, 2004.

"The Last Chroniclers of Croyland," The Ricardian 7.91 (December 1985) 142-177.

"The Croyland Chronicle Tragedies," The Ricardian 7.99 (December 1987) 498-515.

"Croyland Observations." The Ricardian 8.108 (March 1990) 334-341.

"The Case Against Edward IV's Marriage and Offspring: Secrecy; Witchcraft; Secrecy; Precontract," The Ricardian 11.142 (September 1998) 326-35. Reprinted in Inquisitions and Other Trial Procedures in the Medieval West. Aldershot: Ashgate Publishing, 2001, chapter 8.

"Incest and Richard III, Bigamy and Edward IV," Ricardian Bulletin, Spring 2007, pp. 28-30.