WHO
Meslin FX, Kaplan MM., Koprowski H, eds. Laboratory techniques in rabies, 4th ed. Geneva, World Health Organization, 1996.
http://libdoc.who.int/publications/1996/9241544791_eng.pdf
OIE
http://www.oie.int/fileadmin/Home/eng/Health_standards/tahm/2.01.13_RABIES.pdf
Direct Rapid Immunohistochemical Test standard operating procedure
http://www.rabiesblueprint.com/IMG/pdf/DRIT_SOP.pdf