Phelps, W. M. (2014). Nathan hale: The life and death of america's first spy. ForeEdge.
Lua i Stíl Chicago (17ú heag.)Phelps, William M. Nathan Hale: The Life and Death of America's First Spy. Lebanon, New Hampshire: ForeEdge, 2014.
Lua MLA (9ú heag.)Phelps, William M. Nathan Hale: The Life and Death of America's First Spy. ForeEdge, 2014.
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