Grogger, J., & Willis, M. (1998). The introduction of crack cocaine: And the rise in urban crime rates. National Bureau of Economic Research.
Chicago Style (17. basım) AtıfGrogger, Jeff, ve Mike Willis. The Introduction of Crack Cocaine: And the Rise in Urban Crime Rates. Cambridge: National Bureau of Economic Research, 1998.
MLA (9th ed.) AtıfGrogger, Jeff, ve Mike Willis. The Introduction of Crack Cocaine: And the Rise in Urban Crime Rates. National Bureau of Economic Research, 1998.
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