Cita APA (7a ed.)

Hornsby, R., & Hobbs, D. (2008). Gun crime. Ashgate.

Cita Chicago Style (17a ed.)

Hornsby, Robert, y Dick Hobbs. Gun Crime. Aldershot [u.a.]: Ashgate, 2008.

Cita MLA (8a ed.)

Hornsby, Robert, y Dick Hobbs. Gun Crime. Ashgate, 2008.