Galloway, W. 1880. Notice of a Camp on the Midhill-Head, on the Estate of Borthwick Hall, in the Parish of Heriot, Midlothian, the property of D J Macfie, Esq. Proceedings of the Society of Antiquaries of Scotland. 14, (Nov. 1880), 254–260. DOI:https://doi.org/10.9750/PSAS.014.254.260.