1. Huber RA, Headrick AM (1999) Handwriting Identification: Facts and Fundamentals. CRC Press, New York.
2. Leaver W (2006) Introduction to Forensic Document Examination. In: Mozayani A, Noziglia C (eds) The Forensic Laboratory Handbook: Procedures and Practice. Humana, New York, p 225.
3. Homewood SL, Oleksow DL, Leaver WL (1999) Questioned Document Evidence. California District Attorneys Association Forensic Evidence Guidelines VIII-4.
4. Sample of exemplar forms and London Letter
http://www.uslawbooks.com/books/fdeforms.pdf
.
5. Hammond DL (2008) Dichroic Filter Workshop, ST2AR-FDE Fall Workshop, Las Vegas, NV 20–23 Oct 2008.