Doyle, A. C. (1994). The sign of four. Quality Paperback Book Club.
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Dyfyniad Arddull Chicago
Doyle, Arthur Conan. The Sign of Four. New York: Quality Paperback Book Club, 1994.
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Dyfyniad MLA
Doyle, Arthur Conan. The Sign of Four. Quality Paperback Book Club, 1994.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.