Tài liệu tham khảo WikiPedia: S_Voice http://www.cnet.com/8301-17918_1-57574509-85/samsu... http://www.engadget.com/2012/05/03/samsung-s-voice... http://www.gizmofusion.com/2012/05/samsungs-new-s-... http://techcrunch.com/2012/05/03/samsung-the-death... http://cacell.co.za/Samsung-Galaxy-S4-16Gb https://web.archive.org/web/20120524045822/http://... https://web.archive.org/web/20130416152334/http://...
