J. V. Jespersen, Knud. “Veikko Litzen: A War of Roses and Lilies. The Theme of Succession in Sir John Fortescue’s Works. Annales Academiæ Scientiarum Fennicæ, Ser. B, Tom. 173, Helsinki, 1971. - 73 S. + Genealogisk Tavle”. Historisk Tidsskrift, bd. 13, januar 1974, https://tidsskrift.dk/historisktidsskrift/article/view/51514.