When your bibliography includes multiple items by the same author, do not repeat the author's name. Write the first citation normally. In the following citations, replace the name with three em dashes.
Taruskin, Richard. The Danger of Music and Other Anti-Utopian Essays. Berkeley: University of California Press, 2009.
———. Text and Act: Essays on Music and Performance. New York: Oxford University Press, 1995.
———, and Piero Weiss, eds. Music in the Western World: A History in Documents. New York: Schirmer Books, 1984.
To insert one em dash:
On a PC: Alt + Ctrl + Num Lock + dash (repeat 3 times)
On a Mac: Option/Alt + Shift + dash (repeat 3 times)