Tolong jelaskan mengenai Catatan dari Vectari dari Friuli

Paul the Deacon. Historia Langobardorum . Translated by William Dudley Foulke. University of Pennsylvania: 1907.

Hodgkin, Thomas. Italy and her Invaders. Clarendon Press: 1895.

Oman, Charles. The Dark Ages 476–918. Rivingtons: London, 1914.

Musoni, Francesco. Atti del Congresso in Cividale. 1899.

Waitz, Georg, translator. "Pauli Historia Langobardorum." Monumenta Germaniae Historica Scriptores Rerum Langobardicarum.

Bethmann, Ludwig. "Paulus Diakonus Leben," "Paulus Diakonus Schriften," and "Die Geschichtschreibung der Langobarden." Archiv der Gesellschaft fur altere deutsche Geschichtkunde. Vol. 10. Hannover: 1849.