Sources of information
1. http://www.insecta-inspecta.com/fleas/bdeath/bdeath.html
2. http://historymedren.about.com/od/theblackdeath/a/death_defined.htm
3. http://en.wikipedia.org/wiki/Black_Death
4. http://images.google.com/imghp?hl=en&tab=wi
5. http://www.historylearningsite.co.uk/black_death_of_1348_to_1350.htm
6. http://www.britainexpress.com/History/medieval/black-death.htm