"Natural Environment." Poland.pl. 21 Apr. 2009 <http://www.poland.pl/info/information_about_poland/environment.htm>.

"Tourist attractions in warsaw, poland." Essortment Articles: Free Online Articles on Health, Science, Education & More.. 21
 Apr. 2009 <http://www.essortment.com/travel/touristattracti_solq.htm>\

Transport, international transport, polish transport - Poland-transport.eu. 21 Apr. 2009 <http://www.poland-transport.eu/?regions=3&categories=413>.

Answers.com - Online Dictionary, Encyclopedia and much more. 21 Apr. 2009 <http://Answers.com>.