APA (7th ed.) Citation

Institution of Occupational Safety and Health (Great Britain) & Ridley, J. R. (1986). Safety at work (2nd ed.). Butterworths.

Chicago Style (17th ed.) Citation

Institution of Occupational Safety and Health (Great Britain) and John R. Ridley. Safety at Work. 2nd ed. London: Butterworths, 1986.

MLA (9th ed.) Citation

Institution of Occupational Safety and Health (Great Britain) and John R. Ridley. Safety at Work. 2nd ed. Butterworths, 1986.