John M. Jeep: Medieval Germany: An Encyclopedia, Published by Routledge, 2001 ISBN 0824076443, 9780824076443 [1]
Virginia Chieffo Raguin, Sarah Stanbury: Women's Space: Patronage, Place, and Gender in the Medieval Church, Published by SUNY Press, 2005, ISBN 0791463656, 9780791463659 [2]
David E. Wellbery, Judith Ryan, Hans Ulrich Gumbrecht et al.: Published by Belknap Press of Harvard University Press, 2004, ISBN 0674015037, 9780674015036 [3]
Richard Kenneth Emmerson, Sandra Clayton-Emmerson: Key Figures in Medieval Europe: An Encyclopedia, Published by CRC Press, 2006 ISBN 0415973856, 9780415973854 [4]
