King 2002, p. 281. King, Andy (2002). "According to the Custom Used in French and Scottish Wars: Prisoners and Casualties on the Scottish Marches in the Fourteenth Century". Journal of Medieval History. XXVIII (3): 263–290. doi:10.1016/S0048-721X(02)00057-X. ISSN0304-4181. S2CID159873083.
Nicholson 1961, p. 29, n. 2. Nicholson, Ranald (1961). "The Siege of Berwick, 1333". The Scottish Historical Review. XXXX (129): 19–42. JSTOR25526630. OCLC664601468.
Deacon 2017, p. 35. Deacon, Jacob Henry (2017). "Single Combat During the Hundred Year's War: When it wasn't a Game". Medieval Warfare. 7 (3): 35–39. JSTOR48578061.
King 2002, p. 281. King, Andy (2002). "According to the Custom Used in French and Scottish Wars: Prisoners and Casualties on the Scottish Marches in the Fourteenth Century". Journal of Medieval History. XXVIII (3): 263–290. doi:10.1016/S0048-721X(02)00057-X. ISSN0304-4181. S2CID159873083.
Wyntoun 1907, p. 395. Wyntoun, Andrew (1907). Amours, François Joseph (ed.). The Original Chronicle of Scotland. Vol. II. Edinburgh: Blackwood. OCLC61938371.
Brie 1960, p. 281. Brie, Friedrich (1960). The Brut; or, The Chronicles of England. Early English Text Society (repr. ed.). Oxford: Oxford University Press. OCLC15591643.
Nicholson 1961, p. 29, n. 2. Nicholson, Ranald (1961). "The Siege of Berwick, 1333". The Scottish Historical Review. XXXX (129): 19–42. JSTOR25526630. OCLC664601468.
King 2002, p. 281. King, Andy (2002). "According to the Custom Used in French and Scottish Wars: Prisoners and Casualties on the Scottish Marches in the Fourteenth Century". Journal of Medieval History. XXVIII (3): 263–290. doi:10.1016/S0048-721X(02)00057-X. ISSN0304-4181. S2CID159873083.