Source, in full
Letter to Pope Alexander VI. On the impression made by herself, Giovanni, and the Pope's daughter Lucrezia in Pesaro. Archivium Secretum Apostol Vaticum, A.A., Arm. I-XVIII 5027, Lettere di diverse Dame scritte à Papa Alessandro VI, p. 18 · Ludwig Pastor, La Storia dei Papi, Supplemento al III (Rome: Desclee, 1912) letter 6, p. 473. Reported in Rachel Erlanger, Lucrezia Borgia: A Biography (New York: Hawthorn Books, 1978) p. 61