Kertzer explored many sources not previously studied and eventually published The Kidnapping of Edgardo Mortara (1997), which has become the standard reference work for the affair.
Kertzer mengeksplor beberapa sumber yang sebelumnya belum dipelajari dan kemudian menerbitkan The Kidnapping of Edgardo Mortara (1997), yang menjadi karya rujukan standar untuk peristiwa tersebut.