The Oxford Dictionary of the Middle Ages [Reference & Dictionary]
Robert E. Bjork ed.in chief
The Oxford Dictionary of the Middle Ages, 4. vols.
Oxford: Oxford UP 2010, 1968 p.
The Oxford Dictionary of Popes [Reference & Dictionary]
J. N. D. Kelly wit new material by Michael Walsh
The Oxford Dictionary of Popes
Oxford: Oxford UP 2005, 349 p.
Handbuch der Geschichte Russlands [Reference & Dictionary]
Manfred Hellmann hrsg.
Handbuch der Geschichte Russlands, Bd1: Bis 1613
Stuttgart: Hiersemann 1981-89, 1089 S.
A Companion to Medieval World [Reference & Dictionary]
Carol Lansing & Edward D. English（eds.）
A companion to the medieval world（Blackwell companion to European history）
London: Wiley-Blackwell 2009, xii+584 p.
Introduction aux sources de l'histoire médiévale [Reference & Dictionary]
Raoul C. van Caenegem
Introduction aux sources de l'histoire médiévale（Corpus Christianorum Continuatio Mediaevalis）.
Turnhout: Brepols 1997, 649 p.
Lexikon der mittelalterlichen Zahlenbedeutungen [Reference & Dictionary]
Heinz Meyer & Rudolf Suntrup
Lexikon der mittelalterlichen Zahlenbedeutungen（Münster Mittelalter-Schriften 56）
München: Wilhelm Fink 1987, xliv p.+1014 col.
Medieval Scandinavia. An Encyclopedia [Reference & Dictionary]
Philippe Pulsiano（ed.）
Medieval Scandinavia. An Encyclopedia（Garland encyclopedias of the
Middle Ages 1）.
New York: Garland, 1993, 768 p.
Svenskt biografiskt lexikon [Reference & Dictionary]
Bertil Boetius（red.）
Svenskt biografiskt lexikon（CDRom incl. vol. 1-31 in 36）.
Stockholm, 2004
