1909 'To a Poet, who would have me Praise certain Bad Poets, Imitators of His and Mine', complete poem. Collected in The Green Helmet and Other Poems (1910).
William Butler Yeats, Richard J. Finneran, George Bornstein (2007). “The Collected Works of W.B. Yeats Volume IV: Early Essays”, p.51, Simon and Schuster