McDonald, RA (1997). The Kingdom of the Isles: Scotland's Western Seaboard, c. 1100–c. 1336. Scottish Historical Monographs. East Linton: Tuckwell Press. ISBN978-1-898410-85-0.
Murray, N (2002). "A House Divided Against Itself: A Brief Synopsis of the History of Clann Alexandair and the Early Career of "Good John of Islay" c. 1290–1370". In McGuire, NR; Ó Baoill, C (eds.). Rannsachadh na Gàidhlig 2000: Papers Read at the Conference Scottish Gaelic Studies 2000 Held at the University of Aberdeen 2–4 August 2000. Aberdeen: An Clò Gaidhealach. pp. 221–230. ISBN0952391171.