J. V. Jespersen, K. (1974). 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, 13. Hentet fra https://tidsskrift.dk/historisktidsskrift/article/view/51514