בבליוגרפיה

1. http://he.wikipedia.org/wiki/%D7%90%D7%A0%D7%95%D7%A8%D7%A7%D7%A1%D7%99%D7%94_%D7%A0%D7%A8%D7%91%D7%95%D7%96%D7%94

2. http://www.machonshinui.co.il/page.asp?tsys=yeutz_text1&gclid=CNayw8z63JoCFQQ9ZgodcmBV3Q

3. http://images.google.co.il/images?hl=iw&q=%D7%90%D7%A0%D7%95%D7%A8%D7%A7%D7%A1%D7%99%D7%94&um=1&ie=UTF-8&sa=N&tab=wi

4. http://www.infomed.co.il/questions/q_061002_1.htm