Price, R. (1997). Napoleon Hill and the Second Empire. Routledge.
Cita Chicago (17th ed.)Price, Roger. Napoleon Hill and the Second Empire. London: Routledge, 1997.
Cita MLA (9th ed.)Price, Roger. Napoleon Hill and the Second Empire. Routledge, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.