Italian Resources
Scioglilingua Exercise (tongue twisters for fun and practice)
Grammar references
Big Green Book of Italian Verbs by Katrin Maes-Christie and Daniel Franklin Marcello Sensini.
Grammar and Translation for the Italian Libretto by Richard M. Berrong. Excalibur Publishing. 1996.
Grammatica italiana. Milano: Mondador Scuola. 1990
Florio 1611 Italian/English Dictionary