Contract killing (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Contract killing" in English language version.

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books.google.com

Frank Shanty; Patit Paban Mishra (2008). Organized Crime: From Trafficking to Terrorism. ABC-CLIO. p. 210. ISBN 978-1-57607-337-7.
Zagros Madjd-Sadjadi (2013). The Economics of Crime. Business Expert Press. p. 162. ISBN 978-1-60649-583-4.
David Wilson; Elizabeth Yardley; Adam Lynes (2015). Serial Killers and the Phenomenon of Serial Murder: A Student Textbook. Waterside Press - Drew University. p. 43. ISBN 978-1-909976-21-4.
R.J. Parker; Scott Bonn (2017). Blood Money: The Method and Madness of Assassins. ABC-CLIO. pp. 9–10. ISBN 978-1-987902-34-1.
Holmes, Ronald M.; Holmes, Stephen T. (2009). Serial Murder. SAGE. p. 140. ISBN 978-1-4129-7442-4.