Sources
D.B.Miller
George Watson
Girnigoe and Sinclair Castles by Ian Sutherland
Historic Castles and Families in the North by D.B. Miller
History of Caithness by J.T. Calder
Laurel Fechner
Niven Sinclair
Peerage of Scotland by Douglas
Royal Commission on the ancient and historical monuments and constructions of Scotland. Third Report and inventory of Monuments etc. in the County of Caithness.
Sainteclaires of Rosslyn by Father Hay
The Caithness Book edited by Donald Omand
The Castellated and Domestic Architecture of Scotland by McGibbon and Ross
The Fortified House in Scotland by Nigel Tranter
The Orkneyinga Saga by Joseph Anderson
The Scots Peerage edited by Sir James Balfour Paul
The Sinclair Genealogy from "The mists of time" by Niven Sinclair
The St. Clairs of the Isles by Roland William Sinclair