Munch, Peter A, and David Laing. 1862. “Concordia Facta Inter Anglicos Et Scotos, 3d January 1322-3: Communicated in a Letter from Professor Munch to David Laing”. Proceedings of the Society of Antiquaries of Scotland 3 (November):454-64. https://doi.org/10.9750/PSAS.003.454.464.