Reid, Rachael Robertson (1917): «The office of warden of the marches its origin and early history» i: , s. 479–496. doi:10.1093/ehr/xxxii.cxxviii.479. JSTOR 550854. Howard, Pease (1912): : being a brief history of the marches, the laws of march, and the marchmen, together with some account of the ancient feud between England and Scotland. London: Constable. s. 194–201.