More information about Phineas Gage is contained in the following publications
I. John Martyn Harlow's original reports and Henry Jacob Bigelow's assessment:
Harlow, J. M. (1848). Passage of an iron rod through the head. Boston Medical and Surgical Journal, 39, 389-393.
Harlow, J. M. (1868). Recovery from the passage of an iron bar through the head. Publications of the Massachusetts Medical Society, 2, 327-347. (also in booklet form published in Boston in 1869 by D. H. Clapp)
Bigelow, H. J. (1850). Dr. Harlow's case of recovery from the passage of an iron bar through the head. American Journal of the Medical Sciences, 19, 13-22. (also in booklet form published in Philadelphia in 1850 by Collins)
Facsimiles of all three of these reports are in An Odd Kind of Fame (see below)
II. Later comments:
Barker, F. G. (1995). Phineas among the phrenologists: the American crowbar case and nineteenth century theories of cerebral localization. Journal of Neurosurgery, 82, 672-682.
Damasio, H., Grabowski, T., Frank, R., Galaburda, A. M. & Damasio, A. R. (1994). The return of Phineas Gage: The skull of a famous patient yields clues about the brain. Science, 264, 1102-1105. [Erratum, Science, 1994, 265, 1159]
Damasio, A. R. (1994). Descartes' Error. New York: Grosset/Putnam.
Macmillan, M. B. (1986). A wonderful journey through skull and brains: The travels of Mr. Gage's tamping iron. Brain and Cognition, 5, 67-107.
Macmillan, M. (2000). An Odd Kind of Fame: Stories of Phineas Gage. Cambridge, MA: MIT Press.
Macmillan, M. (2008). Phineas Gage: Unravelling the myth. The Psychologist, 21: 828–839. Available online.
Macmillan, M. & Lena, M. L. (2010). Rehabilitating Phineas Gage. Neuropsychological Rehabilitation, 20: 641-658.
Ratiu, P. & Talos, I-F. (2004). The tale of Phineas Gage, digitally remastered. New England Journal of Medicine, 351, e21–e21.
Ratiu, P., Talos, I-F., Hawker, S., Lieberman, D. & Everett, P. (2004). The tale of Phineas Gage, Digitally remastered. Journal of Neurotrauma, 21, 637-643.
Van Horn J. D., Irimia, A., Torgerson, C. M., Chambers, M. C., Kikinis, R., & Toga, A. W. (2012). Mapping connectivity damage in the case of Phineas Gage. PLoS ONE 7(5): e37454.
Wagar, B.M., & Thagard, P. (2004). Spiking Phineas Gage: A neurocomputational theory of cognitive-affective integration in decision making. Psychological Review, 111, 67-79.
Wilgus, J. & Wilgus, B. (2009). Face to face with Phineas Gage. Journal of the History of the Neurosciences, 18, 340-345.
III. A book for juvenile readers:
Fleischman, J. (2002). Phineas Gage: A Gruesome but True Story about Brain Science. Boston, Houghton and Mifflin.