Norton, C. (1989). 20th Century Classics. Boosey & Hawkes.
Lua i Stíl Chicago (17ú heag.)Norton, Christopher. 20th Century Classics. London: Boosey & Hawkes, 1989.
Lua MLA (8ú heag.)Norton, Christopher. 20th Century Classics. Boosey & Hawkes, 1989.
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