Polfer, Michel, Victorinus (A.D. 269-271). De Imperatoribus Romanis: An Online Encyclopedia of Roman Rulers and Their Families (June 3, 2000). Gearchiveerd op 28 mei 2023.
Weigel, Richard D., Claudius II Gothicus (268-270). De Imperatoribus Romanis: An Online Encyclopedia of Roman Rulers and Their Families (June 19, 2001). Gearchiveerd op 22 mei 2023.
Polfer, Michael, Marius (A.D. 269). De Imperatoribus Romanis: An Online Encyclopedia of Roman Rulers and Their Families (June 24, 1999). Gearchiveerd op 1 april 2023.
Polfer, Michel, Tetricus I (AD 271-273). De Imperatoribus Romanis: An Online Encyclopedia of Roman Rulers and Their Families (January 28, 2000). Gearchiveerd op 19 april 2023.
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Polfer, Michel, Victorinus (A.D. 269-271). De Imperatoribus Romanis: An Online Encyclopedia of Roman Rulers and Their Families (June 3, 2000). Gearchiveerd op 28 mei 2023.
Weigel, Richard D., Claudius II Gothicus (268-270). De Imperatoribus Romanis: An Online Encyclopedia of Roman Rulers and Their Families (June 19, 2001). Gearchiveerd op 22 mei 2023.
Polfer, Michael, Marius (A.D. 269). De Imperatoribus Romanis: An Online Encyclopedia of Roman Rulers and Their Families (June 24, 1999). Gearchiveerd op 1 april 2023.
Polfer, Michel, Tetricus I (AD 271-273). De Imperatoribus Romanis: An Online Encyclopedia of Roman Rulers and Their Families (January 28, 2000). Gearchiveerd op 19 april 2023.