Cita APA (7a ed.)

Kilburn, J. C., & Shrum, W. (1998). Private and collective protection in urban areas.

Cita Chicago Style (17a ed.)

Kilburn, J. C., y W. Shrum. Private and Collective Protection in Urban Areas. 1998.

Cita MLA (8a ed.)

Kilburn, J. C., y W. Shrum. Private and Collective Protection in Urban Areas. 1998.