"...CXX boves electos et D marcas solvamus...";
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PERTZ, Georg Heinrich. Einhardi Vita Caroli Magni [online]. Hahnsche Buchhandlung, Hannover, 1911. Dostupné online. (latinsky) cap. 19, MGH Separatim editi
Divisio regnorum,
BORETIUS, Alfred Erwin. Capitularia regum Francorum [online]. Hahnsche Buchhandlung, Hannover, 1883. Dostupné online. (latinsky) tomus I, p. 127, MGH
