Ley, R. J. Francis Bacon, Galileo, and the Brechtian theater: Ralph J. Ley. Essays on Brecht : theater and politics.(1974).
Lua i Stíl Chicago (17ú heag.)Ley, Ralph J. "Francis Bacon, Galileo, and the Brechtian Theater: Ralph J. Ley." Essays on Brecht : Theater and Politics.(1974) .
Lua MLA (8ú heag.)Ley, Ralph J. "Francis Bacon, Galileo, and the Brechtian Theater: Ralph J. Ley." Essays on Brecht : Theater and Politics.(1974), .
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