The Bedford Companion to Shakespeare: An Introduction with Documents./ Russ McDonald.
Shakespeare's Kings: The Great Plays and the History of England in the Middle Ages 1337-1485./ John Julius Norwich.
The Sources of Shakespeare's Plays./ by Kenneth Muir.
Narrative and Dramatic Sources of Shakespeare.
The Globe Playhouse: Its Design and Equipment./ John Cranford Adams.
More titles in the KC-Collections and Robbins library are here.