23Gregory, Lady Augusta, and W. B. Yeats. Cuchulain of Muirthemne: the Story of the Men of the Red Branch of Ulster. London: J. Murray, 1902. 145-46.
An interesting aside to this tale of Aengus and the swans is the fact that the area near Newgrange is a wintering ground for the Whooper Swan, which take up residence in Iceland every October to April. ("101 Facts about Newgrange." Mythical Ireland. Web. <http://www.mythicalireland.com/ancientsites/newgrange-facts/>.)