"Viking custom distinguished morð (O.N.) "secret slaughter," from vig (O.N.) "slaying." The former involved concealment, or slaying a man by night or when asleep, and was a heinous crime. The latter was not a disgrace, if the killer acknowledged his deed, but he was subject to vengeance or demand for compensation."

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American Psychological Association (APA):murder. (n.d.). Online Etymology Dictionary. Retrieved April 01, 2008, from Dictionary.com website: http://dictionary.reference.com/browse/murderChicago Manual Style (CMS):murder. Dictionary.com. Online Etymology Dictionary. Douglas Harper, Historian. http://dictionary.reference.com/browse/murder (accessed: April 01, 2008).Modern Language Association (MLA):"murder." Online Etymology Dictionary. Douglas Harper, Historian. 01 Apr. 2008. .