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  Marion, N. E., & Oliver, W. M. (2006). The public policy of crime and criminal justice. Upper Saddle River, NJ. Pearson/Prentice Hall. Page 22
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  Dunn, W. N. (2008). Public policy analysis: An introduction (4th ed.). Upper Saddle River, NJ. Pearson/Prentice Hall.
 Page 333
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