W. B. Yeats is known for his interest in the occult. This author focuses on the Irish myth of fairies and explains how Yeats, with his Irish culture and imagination, could have believed in the existence of the good people.
"Yeats and the Invisible People of Ireland,"
BYU Studies Quarterly: Vol. 7
, Article 6.
Available at: http://scholarsarchive.byu.edu/byusq/vol7/iss1/6