^Wright, Neil. The Historia Regum Britannie of Geoffrey of Monmouth. Woodbridge, England: Boydell and Brewer. 1984: xvii. ISBN 978-0-85991-641-7.
^Lang, Andrew. History Of English Literature - From Beowulf to Swinburne. Vincent Press. : 45. OCLC 220536211. He says that he has had the advantage of using a book in the Breton tongue which Walter, Archdeacon of Oxford, brought out of Brittany; this book he translates into Latin.
^Wright, Neil. The Historia Regum Britannie of Geoffrey of Monmouth. Woodbridge, England: Boydell and Brewer. 1984: xvii–xviii. ISBN 978-0-85991-641-7. This fusion of heterogeneous sources, which is apparent almost everywhere in the Historia, completely dispels the fiction that the work is no more than a translation of a single Breton (or Welsh) book
^"...the Historia does not bear scrutiny as an authentic history and no scholar today would regard it as such.": Wright (1984: xxviii)
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