1. Beaton, S.J. (2010) Counterparts in modern policing: The influence of corporate investigators on the public police and a call for the broadening of the state action doctrine. Touro Law Review 26 (2): 593–618.
2. Belkin, A. and McNichol, J. (2002) Pink and blue: Outcomes associated with the integration of open gay and lesbian personnel in the San Diego Police Department. Police Quarterly 5 (1): 63–95.
3. Breuer, H. (2010) Mommy P.I. People. 15 March: p. 88.
4. Bureau of Justice Statistics. (2006) Local Police Departments, 2003. Law enforcement management and administrative statistics survey, 1 April, http://bjs.ojp.usdoj.gov/index.cfm?ty=pbdetailiid=1045 , accessed 26 July 2012.
5. Bureau of Labor Statistics. (2010) Occupational Outlook Handbook: Private Detectives and Investigators, Washington DC: US Department of Labor.