Orkneyinga Saga.
St. Olafs Saga.
Saxo Grammaticus. Gesta Danorum.
Heimskringla.
Tacitus. Agricola.
Современные историки
J. Hill Burton. History of Scotland.
A. Bellesheim. History of the Catholic Church in Scotland.
G. Grub. Ecclesiastical History of Scotland.
J. Cunningham. Church History of Scotland.
W. C. Mackenzie. The Highlands and Isles of Scotland.
E. W. Robertson. Scotland under the Early Kings.
Cosmo Innes. Scotland in the Middle Ages.
V. Gordon Childe. The Pre-history of Scotland.
R. Munro. Pre-historic Scotland.
A. Black Scott. St. Ninian.
A. Boyd Smith. The Pictish Church and Nation.
W. Douglas Simpson. The Celtic Church in Scotland. The Historic St. Columba.
J. Dowden. The Celtic Church in Scotland.
R. L. Bremner. The Norsemen in Albann.
A. W. BriDgger. Ancient Emigrants.
J. Johnstone. The Norwegian Account of King Haco's Expedition.
J. Fergusson. Alexander III.
M. F. Moore. The Lands of the Scots Kings in England.
J. MacKinnon and J. A. R. MacKinnon. Constitutional History of Scotland.
I. F. Grant. Economic History of Scotland. Social and Economic Development of Scotland before 1603.
R. W. Billings. Baronial and Ecclesiastical Architecture of Scotland.
D. MacGibbon and T. Ross. Castellated and Domestic Architecture of Scotland. Ecclesiastical Architecture of Scotland
J. Stirling-Maxwell. Shrines and Homes of Scotland.
W. M. Mackenzie. The Mediaeval Castle in Scotland.
С Oman. The Art of War in the Middle Ages.
H. Waddel. The Wandering Scholars.
Англия
R. H. Hodgkin. History of the Anglo-Saxons.
J. H. Ramsay. The Foundations of England. The Angevin Empire.
Ирландия
A. S. Green. History of the Irish to 1014.
E. Curtis. History of Mediaeval Ireland, 1110–1513.
S. Gwynn. A History of Ireland.
Норвегия
Knut Gjerset. History of the Norwegian People.
Франция
E. Lavisse. Histoire de France.
F. P. R. Guizot. Histoire de la civilisation en France.
Европа
С. Oman. The Dark Ages.
T. F. Tout. The Empire and the Papacy.
The Cambridge Mediaeval History.