4 bài nè:
http://thebot.net/free-advertising/253639-mobile-top-up-recharge-online-cheap-easy-and-fast-international-mobile-recharge/#post2599495
http://www.topix.com/forum/business/advertising/T4J86R3MVGR4E9P7M#lastPost
http://forumpromotion.net/forum/viewtopic.php?f=127&t=116063...