"Sergius at once declared the ordinations conferred by Formosus null; but that he put his two predecessors to death, and by illicit relations with Marozia had a son, who was afterwards John XI, must be regarded as highly doubtful. These assertions are only made by bitter or ill-informed adversaries, and are inconsistent with what is said of him by respectable contemporaries [such as Flodoard]." Mann، Horace Kinder (1912)، Sergius III، Robert Appleton Company، ج. XIII، مؤرشف من الأصل في 2019-06-30، اطلع عليه بتاريخ 2008-01-06
"Sergius at once declared the ordinations conferred by Formosus null; but that he put his two predecessors to death, and by illicit relations with Marozia had a son, who was afterwards John XI, must be regarded as highly doubtful. These assertions are only made by bitter or ill-informed adversaries, and are inconsistent with what is said of him by respectable contemporaries [such as Flodoard]." Mann، Horace Kinder (1912)، Sergius III، Robert Appleton Company، ج. XIII، مؤرشف من الأصل في 2019-06-30، اطلع عليه بتاريخ 2008-01-06
Gfrörer، August Friedrich، Allgemeine Kirchengeschichte، A. Krabbe، ج. III، ص. 1133–1275، مؤرشف من الأصل في 2016-09-01، اطلع عليه بتاريخ 2008-01-06
"Sergius at once declared the ordinations conferred by Formosus null; but that he put his two predecessors to death, and by illicit relations with Marozia had a son, who was afterwards John XI, must be regarded as highly doubtful. These assertions are only made by bitter or ill-informed adversaries, and are inconsistent with what is said of him by respectable contemporaries [such as Flodoard]." Mann، Horace Kinder (1912)، Sergius III، Robert Appleton Company، ج. XIII، مؤرشف من الأصل في 2019-06-30، اطلع عليه بتاريخ 2008-01-06
