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