Frankin W. Dixon. (2003). Hardy Boys: Double Jeopardy. Simon & Schuster.
Lua i Stíl Chicago (17ú heag.)Frankin W. Dixon. Hardy Boys: Double Jeopardy. New York: Simon & Schuster, 2003.
Lua MLA (9ú heag.)Frankin W. Dixon. Hardy Boys: Double Jeopardy. Simon & Schuster, 2003.
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