Silberman, M., Ryland, C., & Imbrigotta, K. (2005). Data in online database 'Brecht's Works in English: A Bibliography'. University of Wisconsin-Madison.
Lua i Stíl Chicago (17ú heag.)Silberman, M., C. Ryland, agus K. Imbrigotta. Data in Online Database 'Brecht's Works in English: A Bibliography'. University of Wisconsin-Madison, 2005.
Lua MLA (9ú heag.)Silberman, M., et al. Data in Online Database 'Brecht's Works in English: A Bibliography'. University of Wisconsin-Madison, 2005.
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