UCLA School of Public Health. ↑ Kohn George C. Encyclopedia of plague and pestilence: from ancient times to the present — Infobase Publishing, 2008. — P. 369. — ISBN 0-8160-6935-2. ↑ Byrne Joseph Patrick Encyclopedia of Pestilence, Pandemics, and Plagues: A-M — ABC-CLIO, 2008. — P. 101. — ISBN 0-313-34102-8. ↑ Eastern European Plagues and Epidemics 1300–1918.