Alexander Macbain: The chiefship of Clan Chattan. A lecture delivered to the Inverness Field Club, in November, 1895. Glasgow 1896 (Textarchiv – Internet Archive).
John Ashton Cannon, Robert Crowcroft: mormaers. In: The Oxford Companion to British History. 2. Auflage. Oxford University Press, 2015, ISBN 978-0-19-967783-2, S.634 (books.google.de – Leseprobe).