A History of Western Society @ pages 269-270

The cited information was published by Boston: Houghton Mifflin Co., 1987 (Ref: pages 269-270) The author/originator was John P. McKay, Bennett D. Hill, and John Buckler.
A History of Western Society. 

• References (2)
  • Parent Source: A History of Western Society
  • Individual: Holy Roman Emperor Henry IV