- The Early Scottish Church: The Ecclesiastical History of Scotland from the First to the Twelfth Century
- The Dean of Lismore's Book: A Selection of Ancient Gaelic Poetry
- History of the Scottish Highlands: Highland Clans and Highland Regiments, With an Account of the Gaelic Language, Literature, and Music; Volume 3
- A History of the Scottish Highlands, Highland Clans and Highland Regiments; Volume 1
- Celtic Gleanings