http://www.rccasa.org/StudyManuals/02_CASA_ISE_Vol_1008.pdf

http://www.americanhumane.org/about-us/who-we-are/history/mary-ellen-wilson.html

http://www.childrenservices.org/directservices/USAhistory.html

http://en.wikipedia.org/wiki/Precedent

http://en.wikipedia.org/wiki/Flanking_maneuver

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