Ridley, J. R., & Channing, J. (2004). Safety at work (6th ed.). Oxford: Butterworth Heinemann.
Παραπομπή Chicago StyleRidley, John R., and John Channing. Safety At Work. 6th ed. Oxford: Butterworth Heinemann, 2004.
Παραπομπή MLARidley, John R., and John Channing. Safety At Work. 6th ed. Oxford: Butterworth Heinemann, 2004.
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