Primo Levi Center
Jewish Museum of Rome
Jerusalem Italian Jews Association
Center for Contemporary Jewish Documentation (Italian, some English)
Rabbi Barbara Aiello
Rabbi di Mauro's Jewish Sicily (Italian)
Jewish Tour of Sicily (Italian)

"Short History of Italian Jews"
Detailed history of Jews in Italy
"Italian church becomes synagogue again"
"Still Jewish after all these years"
"My Italian Jewish Last Name"

The Jews of San Nicandro, by John Davis. This book, was the original inspiration for the film.
The Prophet of San Nicandro, by Pinchas Lapide
San Nicandro: The Story of a Religious Phenomenon, by Elena Cassin
The Former Jews of this Kingdom, by Nadia Zeldes