1. Ramón y Cajal, S. (1897) Reglas y Consejos sobre Investigación Cientifica: Los tónicos de la voluntad. [Translation and 3rd edn by Swanson, N. and Swanson, L.W. (2000) Advice for a Young Investigator, MIT Press]
2. Cowan, M.W. (1989) in his foreword to Ramón y Cajal, S. (1901–17) Recuerdos de mi vida. [Translated and edited by Craigie, E.H. and Cano, J. (1989) Recollections of my Life, p. vi, MIT Press]
3. S. Ramón y Cajal, R.G. Harrison, and the beginnings of neuroembryology;Hamburger;Perspect Biol. Med.,1980
4. Early history of mammalian nerve regeneration;West;Neurosci. Behav. Rev.,1978
5. The early history of nerve regeneration beginning with Cruikshank's observations in 1776;Ochs;Med. Hist.,1977