Cameron, Alan (1982). "The Death of Vitalian (520 A.D.)". Zeitschrift für Papyrologie und Epigraphik. 48. Bonn: Dr. Rudolf Habelt GmbH: 93–94. JSTOR20183637. The month of Vitalian's death is taken from the chronicle of Marcellinus Comes, sub anno 520. Alan Cameron discussed the supporting evidence, concluding that Marcellinus is correct.