Cita APA (7a ed.)

Elkin, W. A. (1957). The English penal system. Penguin Books.

Cita Chicago Style (17a ed.)

Elkin, Winifred A. The English Penal System. Harmondsworth, Midd: Penguin Books, 1957.

Cita MLA (8a ed.)

Elkin, Winifred A. The English Penal System. Penguin Books, 1957.