Cita APA

Ridley, J., & Channing, J. (2008). Safety at work (7th ed.). Butterworth-Heinemann.

Chicago Edition Citation

Ridley, John, i John Channing. Safety at Work. 7th ed. Amsterdam: Butterworth-Heinemann, 2008.

Cita MLA

Ridley, John, i John Channing. Safety at Work. 7th ed. Butterworth-Heinemann, 2008.