Milnes, Rodney. "Massenet, Jules"The New Grove Dictionary of Opera, Oxford Music Online, Oxford University Press, retrieved 28 July 2014 (subscription required)
Macdonald, Hugh. "Massenet, Jules", Grove Music Online, Oxford University Press, retrieved 20 July 2014 (subscription required)
Milnes, Rodney. > "Roi de Lahore, Le", Grove Music Online, Oxford University Press, retrieved 13 May 2019 (subscription required)
Milnes, Rodney. "Hérodiade", The New Grove Dictionary of Opera, Oxford Music Online, Oxford University Press, retrieved 29 July 2014 (subscription required)
Milnes, Rodney. "Werther", The New Grove Dictionary of Opera, Oxford Music Online, Oxford University Press, retrieved 29 July 2014 (subscription required)
Forbes, Elizabeth. "Arbell, Lucy", Grove Music Online, Oxford University Press, retrieved 8 August 2014 (subscription required)