O'Connell, J. (1958). A stage history of Richard II, 1800-1920. University of Birminghaml.
Lua i Stíl Chicago (17ú heag.)O'Connell, Jr. A Stage History of Richard II, 1800-1920. England: University of Birminghaml, 1958.
Lua MLA (8ú heag.)O'Connell, Jr. A Stage History of Richard II, 1800-1920. University of Birminghaml, 1958.
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