Yeats was a playwright as well as a poet. To sample some of Yeats's plays, read The Variorum Edition of the Plays of W. B. Yeats (1966), edited by Russell K. Alspach.

In Yeats at Work (1965), Bradford Curtis examines selected manuscripts of Yeats, showing the progression of various poems through numerous revisions.

Mario D'Avanzo compares "The Lake Isle of Innisfree" with "The Song of Solomon" in his 1971 essay in The McNeese Review.

Susan Johnston Graf's 2000 study entitled W. B. Yeats: Twentieth-Century Magus examines Yeats's membership in the Order of the Golden Dawn, an occultist group. Graf also documents Yeats's magical practices and their relation to his work.

To learn more about Innisfree itself, read Tadhg Kilgannon's 1926 book, Sligo and Its Surroundings: A Descriptive and Pictorial Guide to the History, Scenery, Antiquities and Places of Interest in and around Sligo.

Bernard G...