1. Hans Christian Ørsted, The Soul in Nature, with Supplementary Contributions, translated by Leonora and Joanna B. Horner, London: Bohn, 1852.
2. F. Burckhardt et al. (ed.), The Correspondence of Charles Darwin, vol. 4, Cambridge: Cambridge University Press, 1988, pp. 488, 479, 475.
3. F.W. Newman, Phases of Faith [1850], introduction by U.C. Knoepflmacher: Leicester: University Press, 1970; F. M. Turner, John Henry Newman: the Challenge to Evangelical Religion, New Haven, CT: Yale University Press, 2002, pp. 347–352, 613–615.
4. D. C. Christensen, “The Ørsted-Ritter Partnership and the Birth of Romantic Natural Philosophy”, Annals of Science, 52 (1995), pp. 153–185.
5. H.C. Ørsted, Selected Scientific Works, translated and edited by Karen Jelved, Andrew D.Jackson, and Ole Knudsen, introduction by Andrew D.Wilson, Princeton NJ: Princeton University Press, 1998, p.ix.