გამოყენებული ლიტერატურა

1.http://ka.wikipedia.org/wiki/%E1%83%A4%E1%83%A3%E1%83%A2%E1%83%99%E1%83%90%E1%83%A0%E1%83%98
2.http://www.nplg.gov.ge/ec/ka/cart/search.html?cmd=search&pft=biblio&qs=606%3A%E1%83%97%E1%83%90%E1%83%A4%E1%83%9A%E1%83%98%E1%83%97+%E1%83%9B%E1%83%99%E1%83%A3%E1%83%A0%E1%83%9C%E1%83%90%E1%83%9A%E1%83%9D%E1%83%91%E1%83%90
3.http://www.jstor.org/stable/25223410?&Search=yes&searchText=BEE&list=hide&searchUri=%2Faction%2FdoBasicSearch%3FQuery%3DBEE%26acc%3Don%26wc%3Don&prevSearch=&item=12&ttl=62042&returnArticleService=showFullText