1. Aspley Limited (1993). E-fit. Hatfield, UK: Aspley Limited.
2. Bartlett, F. C. (1932). Remembering: A study in experimental and social psychology. Cambridge: Cambridge University Press.
3. Bruce, V. (1988). Recognising faces. Hove, UK: Erlbaum.
4. Bruce, V. and Young, A. W. (1986). Understanding face recognition. British Journal of Psychology, 77, 305–327.
5. Clifford, B. R. and Davies, G. A. (1989). Procedures for obtaining identification evidence. In D. C. Raskin (Ed.), Psychological methods in criminal investigation and evidence. (pp. 47–96). New York: Springer.