- Three Celtic Earldoms: Atholl, Strathearn, Menteith
- The Ruthven Family Papers: The Ruthven Version of The Conspiracy and Assassination at Gowrie House, Perth, 5th August 1600
- The Last Days of Mary Stuart: And the Journal of Bourgoyne Her Physician
- The Royal House Of Stuart: From Its Origin To The Accession Of The House Of Hanover; Volume 2
- The Ruthven Family Papers; the Ruthven Version of the Conspiracy and Assassination at Gowrie House, Perth, 5th August, 1600, Critically rev. and Edited by Samuel Cowan