APA (7th ed.) Citation

Ridley, J. (1986). Safety at work (2. ed.). Butterworths.

Chicago Style (17th ed.) Citation

Ridley, John. Safety at Work. 2. ed. London [u.a.]: Butterworths, 1986.

MLA (9th ed.) Citation

Ridley, John. Safety at Work. 2. ed. Butterworths, 1986.