^Encyclopedia Britannica "
The Middle-Ages" Retrieved October 14, 2020
Further reading
Langer, William. An Encyclopedia of World History (5th ed. 1973); highly detailed outline of events
online free
Morris, Richard B. and Graham W. Irwin, eds. Harper Encyclopedia of the Modern World: A Concise Reference History from 1760 to the Present (1970)
online
^Encyclopedia Britannica "
The Middle-Ages" Retrieved October 14, 2020
Further reading
Langer, William. An Encyclopedia of World History (5th ed. 1973); highly detailed outline of events
online free
Morris, Richard B. and Graham W. Irwin, eds. Harper Encyclopedia of the Modern World: A Concise Reference History from 1760 to the Present (1970)
online