Ships, Guns and Money: The Logistics of Revolution and Garibaldi’s Campaign of 1860 

Garibaldi: Invention of a Hero (Yale University Press, 2007), by Lucy Riall. 

Enrico Acciai with a more long-term history of Garibaldi's legacy in the terms of war volunteering

Maurizio Isabella providing a good summary of histories of Italy in the nineteenth-century

David Sims with using a "follow the money" approach to Irish nationalism in the same time period

And finally some background on the nineteenth-century Mediterranean