Dana, A. G. (1928). Porto Rico's Case, Outcome of American Soverignity, 1898-24, 1925-28. New Haven, Conn.
Lua i Stíl Chicago (17ú heag.)Dana, Arnold Guyot. Porto Rico's Case, Outcome of American Soverignity, 1898-24, 1925-28. New Haven, Conn, 1928.
Lua MLA (8ú heag.)Dana, Arnold Guyot. Porto Rico's Case, Outcome of American Soverignity, 1898-24, 1925-28. New Haven, Conn, 1928.
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