J.M. Andrews in engelskspråkleg Wikipedia, https://en.wikipedia.org/wiki/J._M._Andrews, lese 15. juli 2019. Sjå ogso Henry Boyland (red): A dictionary of Irish biography. Dublin, Gill and MacMillan 1999, s. 5 ISBN 0-7171-2945-4 og Kate Newman (red.): Dictionary of Ulster Biography. Belfast, Institute of Irish Studies (Queen's University) 1993, s.5 ISBN 0-85389-478-7