Start with high-confidence italian literary criticism books, then narrow by subgenre or adjacent topics.
Lectures on Don Quixote
Vladimir Nabokov, Fredson Bowers
Latin Poetry and the Judgement of Taste
Charles Martindale
The Civilization of the Renaissance in Italy
Jacob Burckhardt
Dante Encyclopedia
Richard Lansing
Numero Zero
Umberto Eco, Richard Dixon
What God Kept for Himself
Umberto Grassi
Marvelous Solitude
Lina Bolzoni, Sylvia Greenup
Mismapping the Underworld
John Kleiner
The Absence of Grace
Harry Berger, Harry Berger Jr.
The Spell of Italy
Richard Block
Thomas Mann's <i>death in Venice</i>
Ellis Shookman
Approaches to Teaching the Works of Italo Calvino
Franco Ricci, Andrea Dini