APA (7th ed.) Citation

Duggan, M. G. (2001). More Guns, More Crime. Journal of political economy. doi:10.1086/322833

Chicago Style (17th ed.) Citation

Duggan, Mark G. "More Guns, More Crime." Journal of Political Economy 2001. https://doi.org/10.1086/322833.

MLA (9th ed.) Citation

Duggan, Mark G. "More Guns, More Crime." Journal of Political Economy, 2001, https://doi.org/10.1086/322833.