Opera Software

Sejarah Browser Opera | Computesta, di akses Minggu, 7 Juli 2013 pukul 13:26:48
Haavard - 300 million users strong, Opera moves to WebKit, di akses Minggu, 7 Juli 2013 pukul 13:30:40
Opera gears up at 300 million users - Opera Software, di akses Minggu, 7 Juli 2013 pukul 13:33:01