Cita APA (7a ed.)

Dunbar, I., & Langdon, A. (1998). Tough justice: Sentencing and penal policies in the 1990s (1. publ.). Blackstone Press.

Cita Chicago Style (17a ed.)

Dunbar, Ian, y Anthony Langdon. Tough Justice: Sentencing and Penal Policies in the 1990s. 1. publ. London: Blackstone Press, 1998.

Cita MLA (8a ed.)

Dunbar, Ian, y Anthony Langdon. Tough Justice: Sentencing and Penal Policies in the 1990s. 1. publ. Blackstone Press, 1998.