6Jones, Carleton. Temples of Stone: Exploring the Megalithic Tombs of Ireland. Cork: Collins, 2007. 104-110.
According to the author the additions to Creevykeel, with their added complexity, plus the extension of the court arms to conceal its interior might be "...evidence for increasing control over the esoteric knowledge the monuments contained by a small segment of the population and the corresponding exclusion of the majority of the population from that knowledge."
Peter Harbison called Creevykeel "one of the finest court tombs in the country." (Harbison, Peter. Guide to the National and Historic Monuments of Ireland. Dublin: Gill and Macmillan, 1992. 291.)
The excavation of Creevykeel was undertaken by the Fourth Harvard Archaeological Expedition in Ireland between July 25 and September 4, 1935. There were twenty-seven men engaged in the excavation, (Hencken, H. O'Neill. "A Long Cairn at Creevykeel, Co. Sligo." The Journal of the Royal Society of Antiquaries of Ireland 2 (1939): 56-58.)