User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 42: June 2015/@comment-1153699-20150702021033/@comment-25324252-20150702182937

http://fairytail.wikia.com/wiki/User_blog:Leek0421/The_strongest_Female_Fairy_Tail_wizard#comm-227755 Here you go, my source