"W. S. Gilbert", The Cambridge History of English and American Literature in 18 Volumes (1907–21), Volume XIII, "The Victorian Age", Part One. VIII. Nineteenth-Century Drama, § 15, Bartleby.com, accessed 27 May 2009
Samuels, Edward. "International Copyright Relations"Archived 28 October 2008 at the Wayback Machine in The Illustrated Story of Copyright, Edwardsamuels.com, accessed 19 September 2011. Note the box "When Gilbert and Sullivan attacked the 'Pirates.'"
Bond, Jessie. The Reminiscences of Jessie Bond, Chapter 4 (1930), reprinted at The Gilbert and Sullivan Archive, 15 November 2008, accessed 21 August 2012
Stone, David. Robert Cunningham (1892–93), Who Was Who in the D'Oyly Carte Opera Company, 4 September 2009, accessed 25 May 2017
Cole, Sarah. Broken Hearts, The Gilbert and Sullivan Archive, 23 December 2000, accessed 21 August 2012
Crowther, Andrew (13 August 2018). "The Carpet Quarrel Explained". The Gilbert and Sullivan Archive. Retrieved 10 October 2021.
Shepherd, Marc. "Introduction: Historical Context", The Grand Duke, p. vii, New York: Oakapple Press, 2009. Linked at The Gilbert and Sullivan Archive, accessed 7 July 2009.
Gilbert's Plays, The Gilbert and Sullivan Archive, accessed 21 August 2012
Walbrook, H. M. "The English Offenbach", Gilbert & Sullivan Opera: A History and a Comment, reprinted at The Gilbert and Sullivan Archive, 28 September 2003, accessed 27 May 2009
In one unsuccessful attempt, the partners hired an American, George Lowell Tracy, to create the piano arrangement of the scores of Princess Ida and The Mikado, hoping that he would obtain rights that he could assign to them. See, Murrell, Pam. "Gilbert & Sullivan’s American Ally", In the Muse, US Library of Congress, 5 August 2020.
Bradley (1996), p. 178; and Bowyer, Bertram (Lord Denham). "D'Oyly Carte Opera Company", UK Parliament, 1 April 1998 (quote: "...the 'Gilbertian ending' ... after two acts in which the principal protagonists contrive to get themselves into a more and more convoluted state of utter hopelessness, a final twist – whimsical but wholly logical and even believable – makes everything come out all right again, and everyone lives happily ever after."
Samuels, Edward. "International Copyright Relations"Archived 28 October 2008 at the Wayback Machine in The Illustrated Story of Copyright, Edwardsamuels.com, accessed 19 September 2011. Note the box "When Gilbert and Sullivan attacked the 'Pirates.'"
Rollins and Witts, Appendix pp. x–xi; and Shepherd, Marc. "The First D'Oyly Carte Recordings", the Gilbert and Sullivan Discography, 18 November 2001, accessed 5 October 2014
Rollins and Witts, Appendix, pp. xi–xiii; and Shepherd, Marc. "G&S Discography: The Electrical Era", the Gilbert and Sullivan Discography, 18 November 2001, accessed 5 October 2014
