Thực đơn
Opera Chú thíchThực đơn
Opera Chú thíchLiên quan
Opera Opera Việt Nam Opera (trình duyệt web) Opera Software Operation Mincemeat (phim) Opera Nova Bydgoszcz Opera Mini Operação Prato Opera GX (trình duyệt web) Opera LeśnaTài liệu tham khảo
WikiPedia: Opera http://www.opera-opera.com.au/archives.htm http://www.opera-opera.com.au/plotind.htm http://www.american.com/archive/2007/july-august-m... http://www.britannica.com/EBchecked/topic/348741/L... http://www.britannica.com/EBchecked/topic/429776/o... http://books.google.com/books?id=fovWU9Prkj0C&lpg=... http://www.historicopera.com http://operabase.com http://www.stageagent.com/browse/showtype/opera http://opera.stanford.edu/main.html