12MacNeill, Maire. The Festival of Lughnasa. London: Oxford University Press, 1962. 345-46.
Geároid Iarla was also known as "Gerald the Rhymer." (Killanin, Michael Morris, and Michael V. Duignan. The Shell Guide to Ireland. London: Ebury P. in Association with George Rainbird, 1967. 358-59.)
One of the better known poems attributed to Geároid Iarla is entitled "Speak Not Ill of Womankind." This may be read in its entirety here.