Dyfyniad APA

Ridley, J., & Channing, J. (2003). Safety at work (6th ed.). Butterworth- Heinemann.

Dyfyniad Arddull Chicago

Ridley, John, and John Channing. Safety at Work. 6th ed. Amsterdam: Butterworth- Heinemann, 2003.

Dyfyniad MLA

Ridley, John, and John Channing. Safety at Work. 6th ed. Butterworth- Heinemann, 2003.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.