The alphabetic part sources are found in B. Cooper's, After the Flood'

A) To read about Nennius and `The Table of European Nations' see Nennius, `Historia Brittonum', written probably toward the end of the 8th century AD. Nennius copied his sources without editing so we could make of them what we would. His most important contributions are found in chapter 17 and 18 which records the origins of a considerable number of European nations.
B) Elbod/Elbodogus/Elvodogus/Elvodug/Elfoddw is known from `Annales Cambriae', late 8th century AD.
C) Sir Flinders Petrie's lecture on the overlooked or willfully ignored body of documentary historical writings can be read in his Neglected British History published by Humphrey Milford, Oxford University Press as part of the `Proceedings of the British Academy', Vol. viii, pp. 1-28.
D) Geoffrey of Monmouth, the `Tysilio Chronicle' listed today as Jesus College MS LXI, Bodleian Library, Oxford.
E) Peter Roberts, `Chronicle of the Kings', 1811, a sole surviving copy is at the Bodleian Library under "T301". Please someone copy it by hand to preserve it. Manley Pope presented a poor account of it in his `A History of the Kings of Ancient Britain, Simpkin, Marshall & Co., London, 1862; in which he does not credit Peter Roberts. However see his notes pp. 155-216.
F) The OT biblical account brings home the significance of priestly functions and services in society from the time of the Patriarchs onward. This spiritual make up of the nations of the whole ancient Middle East and beyond also was present in ancient Egypt where also originally one God was worshipped, albeit called by different names by the officials of different temple precincts. See P. Renouf, `The Priestly Character of the Earliest Egyptian Civilization' in PSBA, Nov. 1889, p. 355-362.