1. Al-Zahrani, A. (2007). Darwin’s metaphors revisited: Conceptual metaphors, conceptual blends, and idealized cognitive models in the theory of evolution. Metaphor and Symbol, 23, 50–82.
2. Barlow, N. (Ed.). (1958). The autobiography of Charles Darwin 1809–1882. With the original omissions restored. Edited and with appendix and notes by his grand-daughter Nora Barlow. London: Collins.
3. Browne, J. (2002). The power of place. Volume II of a biography. Princeton: Princeton University Press.
4. Darwin, C. (1859). On the origin of species by means of natural selection, or the preservation of favoured races in the struggle for life. London: John Murray.
5. Darwin, C. (1861). On the origin of species by means of natural selection, or the preservation of favoured races in the struggle for life (3rd ed.). London: John Murray.