نقل قول:کد:http://daneshnameh.roshd.ir/mavara/mavara-index.php?page=%d8%b1%db%8c%d8%a8%d9%88%d8%b2%d9%88%d9%85&SSOReturnPage=Check&Rand=0
کد:http://fa.wikipedia.org/wiki/%D8%B1%DB%8C%D8%A8%D9%88%D8%B2%D9%88%D9%85
کد:http://edu.tebyan.net/biology/cells/2-3-7.htm
کد:http://www.zistpayam.blogfa.com/post-98.aspx