APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Elkin, W. A. The English Penal System / by W.A. Elkin. Penguin, 1957.

MLA (9th ed.) Citation

Elkin, W. A. The English Penal System / by W.A. Elkin. Penguin, 1957.

Warning: These citations may not always be 100% accurate.