Blum, Gabriella and Philip Heymann (June 2010). "Law and Policy of Targeted Killing"(PDF). National Security Journal: 145–170, 146. Archived from the original(PDF) on 7 September 2012. Retrieved 7 February 2013.
Blum, Gabriella and Philip Heymann (June 2010). "Law and Policy of Targeted Killing"(PDF). National Security Journal: 145–170, 146. Archived from the original(PDF) on 7 September 2012. Retrieved 7 February 2013.