Laing, David. “John Earl of Gowrye, and the Alleged Conspiracy at Perth, August 5, 1600: An Historical Inquiry, in Two Parts: Part First - The King’s Manifesto; Or, ’A Discourse of the Unnatural and Vile Conspiracie,’ &C. Edinburgh, 1600”. Proceedings of the Society of Antiquaries of Scotland, vol. 12, Nov. 1877, p. 311, doi:10.9750/PSAS.012.311.