Cita APA (7a ed.)

O'Brien, M. (2012). Prisons exposed. Y Lolfa.

Cita Chicago Style (17a ed.)

O'Brien, Michael. Prisons Exposed. Talybont, Ceredigion: Y Lolfa, 2012.

Cita MLA (8a ed.)

O'Brien, Michael. Prisons Exposed. Y Lolfa, 2012.