Percy Bysshe Shelley (1840). “Journal of a six weeks' tour. Letters from Geneva. Journal at Geneva: ghost stories, Journal: return to England. Letters from Italy”, p.129
Percy Bysshe Shelley (1852). “A defence of poetry. Essay on the literature, arts, and manners of the Athenians. Preface to the Banquet of Plato. The banquet”, p.35
Percy Bysshe Shelley (1830). “The Beauties of Percy Bysshe Shelley: Consisting of Miscellaneous Selections from His Poetical Works. The Entire Poems of Adonais and Alastor, and a Revised Edition of Queen Mab, Free from All the Objectionable Passages. With a Biographical Preface”, p.214