Pier della Vigna (2024) Letters in 5 books: Critical edition of the oldest systematic collection, by Debora Riso. Introduction by Fulvio Delle Donne. Edited by D. Riso. SHARE Books (Miscellaneous). Available at: https://www.fedoabooks.unina.it/index.php/fedoapress/catalog/book/978-88-98943-78-4 (Accessed: 20 September 2026).