APA (7th ed.) Citation

ScienceDirect (Online service) & Ridley, J. R. (1990). Safety at work (Third edition.). Butterworth-Heinemann.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service) and John R. Ridley. Safety at Work. Third edition. London ; Boston: Butterworth-Heinemann, 1990.

MLA (9th ed.) Citation

ScienceDirect (Online service) and John R. Ridley. Safety at Work. Third edition. Butterworth-Heinemann, 1990.

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