APA (7th ed.) Citation

Duggan, M. G. (2000). More guns, more crime. NBER.

Chicago Style (17th ed.) Citation

Duggan, Mark G. More Guns, More Crime. Cambridge, Mass: NBER, 2000.

MLA (9th ed.) Citation

Duggan, Mark G. More Guns, More Crime. NBER, 2000.