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Paul, Catherine E. “W. B. Yeats and the Problem of Belief.” Yeats’s Legacies: Yeats Annual No. 21. pp. 295-316. 2018.
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Richards, Shaun. "Yeats's Theatre and the Contemporary Crisis of Nihilism." Irish University Review, Vol. 24, No. 2 (1994). pp. 198-211.