There are 2 titles associated with this person.

de Sismondi, Jean-Charles-Léonard S. A History of the Italian Republics. Being a view of the Origin Progress and Fall of Italian Freedom by J.C.L. De Sismodi. In One Volume. London: Longman, Rees, Orme, Brown, and Green, John Taylor, 1832.
de Sismondi, Jean-Charles-Léonard S. A History of the Fall of the Roman Empire. Comprising a view of the invasion and settlement of the barbarians. London: Longman, Rees, Orme, Brown, Green and Longman, 1834.