The following is a partial list of materials read and researched for information regarding castles and European history in general. As you can see, the material contained in this limited web presentation doesn't touch a fraction of the material in these publications. Books, books books. Still the best and most convenient method of study.

Title Author Publisher
Castles and Fortresses Robbin Oggins Metro Books
Castles of Europe Wm. Anderson/Photos: Wim Swam Park Lane/Crown Books
Medieval Germany - 1056-1273 Alfred Haverkamp Oxford University Press
Germany in the High Middle Ages - c1050-1200 Horst Fuhrmann Cambridge University Press
Cathedrals and Castles - Building in the Middle Ages Alain Erlande-Brandenburg Harry N. Abrams
Warfare in Feudal Europe - 730-1200 John Beeler Cornell University Press
Castles of Germany Stars and Stripes Publ.
The Barbarian Invasions Hans Delbrück/ translation: W.J. Renfroe Jr. Bison Books/University of Nebraska Press
Life in a Medieval City Joseph and Frances Gies Harper & Row
The Cross & the Crescent - A History of the Crusades Malcolm Billings Sterling Publishing
The Origins of Modern Germany G. Barraclough W. W. Norton & Co.
Life in Medieval Times Marjorie Rowling Perigee Book/Putnam Publishing
Medieval Technology and Social Change Lynn White Jr. Oxford University Press
A Distant Mirror - The Calamities of the 14th Century Barbara Tuchman Balantine Books
War in European History Michael Howard Oxford University Press
Life in a Medieval Castle Joseph and Frances Gies Harper & Row
Castles, Their Construction and History Sidney Toy Dover Publishing
Medieval Warfare Hans Delbrück/ translation: W.J. Renfroe Jr. University of Nebraska
World History Fact Finder Colin McEvedy Gallery Books/W.H. Smith Publ.
The Oxford Illustrated History of Medieval Europe Edited by George Holmes Oxford University Press
The High Middle Ages in Germany Edited by Rolf Toman Benedikt Taschen Publishing
Deutschland (from 1924) Kurt Hielscher & Hans Thoma Ernst Wasmuth Publ., Berlin
The Medieval Castle Philip Warner Barnes & Noble
The Germanic People - Origin, Expansion & Culture Francis Owen Barnes & Noble
An Illustrated History of Arms & Armour Charles Henry Ashdown Wordsworth Editions Ltd.
The History of Chivalry and Armor Dr. F. Kottenkamp/transl. by the Rev. A. Lowry Portland House
Crusader Castles Hugh Kennedy Cambridge Press
The Germanic Invasions Lucien Musset Barnes & Noble
Deutsche Burgen (G)(German Castles) (Autographed 1914) Karl Robert Langewiesche Königstein Publishing
Medieval Fortifications John R. Kenyon Leicester University Press/Pinter Publ.
Die Deutsche Burgen & Schlösser (G) Wolfgang Krüger Publishing
 German Castles and Palaces  Klaus Merten & Paolo Marton  The Vendom Press
 Germany - Cambridge Illustrated History  Martin Kitchen  Cambridge University Press