Roper, J. (2009). The illustrated encyclopedia of the presidents of America: An authoritative history of the American presidency, shown in more than 460 photographs and illustrations. Hermes House.
Cita Chicago (17th ed.)Roper, Jon. The Illustrated Encyclopedia of the Presidents of America: An Authoritative History of the American Presidency, Shown in More than 460 Photographs and Illustrations. London: Hermes House, 2009.
Cita MLA (9th ed.)Roper, Jon. The Illustrated Encyclopedia of the Presidents of America: An Authoritative History of the American Presidency, Shown in More than 460 Photographs and Illustrations. Hermes House, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.