Ferguson, H. (1995). Keyboard duets: From the 16th to the 20th century. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Ferguson, Howard. Keyboard Duets: From the 16th to the 20th Century. Oxford: Oxford University Press, 1995.
Lua MLA (9ú heag.)Ferguson, Howard. Keyboard Duets: From the 16th to the 20th Century. Oxford University Press, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.