⁹"Oisín." Wikipedia, the Free Encyclopedia. Web. 20 Oct. 2011. <http://en.wikipedia.org/wiki/Ois%C3%ADn>.
In a 1945 article, J.W. Delargy explains that "'Whistling at night or Fianna Focht by day' were considered unlucky." He also asserted that the telling of these tales was usually restricted to men. (Delargy, H.H. "The Gaelic Story-teller." Proceedings of the British Academy 31 (1945): 7.)