References works on historical themes are found shelved with books on the same subject. They have red tape on the spine to highlight the fact they cannot be borrowed.
General:
Urwin, D. Dictionary of European History and Politics
Classical:
Grafton, A. The classical tradition (Cambridge, Mass., 2010)
Medieval:
Ditchburn, D. Atlas of medieval Europe (London, 1997)
Haywood, J. Penguin historical atlas of the Vikings (London, 1995)
Kibler, W. Medieval France: an encyclopedia (New York, 1995)
Pulsiano, P. Medieval Scandinavia: an encyclopedia (New York, 1993)
Slack, C. Historical dictionary of the Crusades (Oxford, 2003)
Strayer, J. Dictionary of the Middle Ages (New York, 1982-)
Early Modern:
Carney, J. Renaissance and Reformation : a biographical dictionary (Westport, 2001)Deward, J. Europe 1450 to 1789 :encyclopedia of the early modern world (London, 2004)
Williams, E. Penguin dictionary of English and European history, 1485-1789 (London, 1980)
Modern:
Cook, C. British historical facts, 1688-1760 (London, 1988)
Cook, C. British historical facts, 1760-1830 (London, 1980)
Cook, C. British historical facts, 1830-1900 (London, 1975)
Cook, C. European political facts, 1918-1973 ( London, 1975)
Coppa, F. Dictionary of modern Italian history (Westport, 1985)
Daburdo, L. Encyclopedia of Romantics: culture in Britain, 1780s-1830s (New York, 1992)
Palmer, A. Penguin dictionary of modern history, 1789-1945 (London, 1983)
Palmer, A. Penguin dictionary of twentieth century history (London, 1979)
Dictionary of national biography
Anyone of note who is British and died before 2007