Корисні посилання

https://sites.google.com/site/inf9klas/9-klas-1 

http://shkolyar.com.ua/o/20/

http://sagevg.wordpress.com/2012/03/09/%D1%86%D1%96%D0%BA%D0%B0%D0%B2%D1%96-%D0%B2%D0%B8%D1%81%D0%BB%D0%BE%D0%B2%D0%B8-%D0%BF%D1%80%D0%BE-%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D1%83/