1. Questioned Documents;Osborn,1929
2. Suspect Documents: Their Scientific Examination;Harrison,1958
3. How individual are personal writing habits?;Hilton;Journal of Forensic Sciences,1983
4. Effects of slope change in handwriting;Jamieson;Canadian Society of Forensic Science Journal,1983
5. A study of the handwriting of adolescents;Masson;Journal of Forensic Sciences,1988