Virgilio Ilari and Piero Crociani. "Five Neapolitan Regiments in Peninsular War 1808-1813" [In Italian]:
http://www.archive.org/details/FiveNeapolitanRegimentsInPeninsularWar1808-1813
The 1st and 2nd Neapolitan line, 1st Neapolitan light, 1st and 2nd Neapolitan chasseurs.