1. Alzheimer-Europe. Other ethical principles: personhood. http://www.alzheimer-europe.org/Ethics/Definitions-and-approaches/Other-ethical-principles/Personhood. Last updated 16 Jan 2013
2. Corazón R (2010) Persona. In: González AL (ed) Diccionario de Filosofía. Eunsa, Pamplona, pp 859–867
3. Dilthey W (1989) Introduction to the human sciences. In: Makkreel RA, Rodi F (eds) Selected works, vol I. Princeton University Press, Princeton, 1985–2010
4. Esclanda R, Sellés JF (2016) Leonardo Polo: a brief introduction, 3rd edn. Leonardo Polo Institute of Philosophy Press, South Bend
5. Ferrater Mora J (1994) Espíritu. In: Ferrater Mora J (ed) Diccionario de Filosofía. Ariel, Barcelona, pp 1099–1104