Source

http://en.wikipedia.org/wiki/Winter_of_2010–2011_in_Europe
http://en.wikipedia.org/wiki/Winter_of_2009–2010_in_Europe
http://www.ready.gov/winter
http://ec.europa.eu/echo/civil_protection/civil/vademecum/pl/2-pl-1.html#over
http://ec.europa.eu/echo/civil_protection/civil/vademecum/pl/2-pl-3.html#trai

http://disaster.ifas.ufl.edu/PDFS/CHAP17/D17-08.PDF

http://id.wikipedia.org/wiki/Polandia 

http://id.wikipedia.org/wiki/Bencana_alam 

http://www.artikata.com/translate.php
http://polandesia.files.wordpress.com/2010/09/winter-2010-poland-r.png
http://www.weather.com/outlook/weatherbycountry/poland