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 ... With a Biographical Preface. Second Edition”, p.32
Jawaharlal Nehru, H. N. Sethna (1981). “Proceedings of the International Seminar on Science, Technology, and Society in Developing Countries, Bombay, November 1979”