National Center for State Courts. "Fingerprint." http://ctl.ncsc.dni.us/biomet%20web/BMFingerprint.html.
National Center for State Courts. "Retinal Scan." http://ctl.ncsc.dni.us/biomet%20web/BMRetinal.html
National Institutes of Health. "Cases." http://www.nlm.nih.gov/visibleproofs/galleries/cases/vucetich.html.
New York State Division of Criminal Justice Services. "Fingerprint Classification Systems Compared." http://criminaljustice.state.ny.us/ojis/history/ph_am_hn.htm.