FOULIS OF COLINTON, John. Of the league said to have been formed between the Emperor Charlemagne and the King of Scotland. Archaeologia Scotica, [S. l.], v. 1, p. 26–28, 1792. DOI: 10.9750/arch.scot.1.26-28. Disponível em: https://journals.socantscot.org/index.php/arch-scot/article/view/362. Acesso em: 18 may. 2024.