⁶Borlase, William Copeland. The Dolmens of Ireland, Their Distribution, Structural Characteristics, and Affinities in Other Countries. Vol. 3. London: Chapman & Hall, Ld., 1897. 768.
Borlase is here referencing Windele's observations from a half century earlier (MS J. Windele "Cork W. and N.E." p. 79). Some refer to a stone alignment such as this as a "four-poster."