Mitchell Otis C. Two German Crowns: Monarchy and Empire in Medieval Germany

Bristol, Ind. : Wyndham Hall Press, 1985. — 95 p. — ISBN 0-932269-66-4.Preface Introduction.
Prelude to Germany:
Frankish Ascendancy and Legacy.
Civil Conflict, Partition, and Disintegration.
From Shadow King to German Dynasty.
The Investiture Controversy CHAPTER FIVE.
The Revival and Decline of Imperial Power (1152-1291).
Germany in the Later Middle Ages (1291-1517).
The Overlapping Concepts: Medieval German Monarchy and Medieval "Roman" Empire Notes About the Author.