Norton, C. (1989). 20th Century Classics. Boosey & Hawkes.
Chicago-Zitierstil (17. Ausg.)Norton, Christopher. 20th Century Classics. London: Boosey & Hawkes, 1989.
MLA-Zitierstil (8. Ausg.)Norton, Christopher. 20th Century Classics. Boosey & Hawkes, 1989.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.