Gray, R. D. (1976). Brecht the dramatist. Cambridge University Press.
芝加哥风格引文Gray, Ronald D. Brecht the Dramatist. Cambridge [Eng.] ; New York: Cambridge University Press, 1976.
MLA引文Gray, Ronald D. Brecht the Dramatist. Cambridge University Press, 1976.
警告：这些引文格式不一定是100％准确.