Franklin

MLA

Crawford, B. E. The Northern Earldoms : Orkney and Caithness From Ad 870 to 1470. .

APA

Crawford, B. E. The Northern earldoms : Orkney and Caithness from AD 870 to 1470. .

Chicago

Crawford, B. E. The Northern Earldoms: Orkney and Caithness From AD 870 to 1470.