(en) T. Bose et R. N. Colbeck, A Bookman's Catalogue Vol. 2 M-End: The Norman Colbeck Collection of Nineteenth-Century and Edwardian Poetry and Belles Lettres, UBC Press, (ISBN978-0-7748-4481-9, lire en ligne)
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(en) Oscar Wilde: Poems in Prose and Private Letters ; Including an Intimate Preface by His Biographer, Frank Harris, Pearson's (25c) Library, (lire en ligne), p. 10
(en) Leanne Grech, Oscar Wilde's Aesthetic Education: The Oxford Classical Curriculum, Springer, (ISBN978-3-030-14374-9, lire en ligne), p. 26