• According to: Alan Orr Anderson, Early Sources of Scottish History, 2 vols. (Edinburgh, 1922, reprinted Stamford, 1990).

Máel Coluim witnessed a charter of his brother Duncan II (III ?).

See footnote no. 2, pgs. 25 & 26, in volume II. http://ia700409.us.archive.org/33/items/cu31924077097958/cu31924077...

• Sir Leslie Stephen, ed.. The Dictionary of National Biography Founded in 1882 by George Smith. Vol. I-XX, XXII. London, England: Oxford University Press, 1921-1922 .pp. 884-885
• About Dictionary of National Biography, Volumes 1-20, 22

The Dictionary of National Biography began in 1882 as an ambitious project spearheaded by George Smith to produce a biographical dictionary of prominent figures from Britain and Ireland from the earliest of times up to 1900. The efforts of hundreds of contributors resulted in a 22 volume alphabetical series containing thousands of biographies. This database contains Volumes 1-20, and 22 of this series, which includes the biographies of those with surnames Abbadie-Whewell. It also contains The Concise Dictionary, which is a summary guide and index to the rest of the series, and also the Supplement, which deals with people who died too late to be included in the earlier volumes.