Galloway, William. 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 (November), 254-60. https://doi.org/10.9750/PSAS.014.254.260.