The Oxford illustrated history of opera
(Book)

The seventeenth century / Tim Carter

The eighteenth century : serious opera ; The eighteenth century : comic opera / Thomas Bauman

The nineteenth century : France / David Charlton

The nineteenth century : Italy / William Ashbrook

The nineteenth century : Germany / Barry Millington

Russian, Czech, Polish, and Hungarian opera to 1900 / John Tyrrell

The twentieth century : to 1945 ; The twentieth century : 1945 to the present day / Paul Griffiths

The staging of opera / Roger Savage

Opera singers / William Ashbrook

Opera as a social occasion / John Rosselli.