349201 Ridley, J., & Pearce, D. (2003). Safety with machinery. Oxford : Butterworth-Heinemann.
Cita Chicago (17th ed.)349201 Ridley, John, i Dick Pearce. Safety with Machinery. Oxford : Butterworth-Heinemann, 2003.
Cita MLA (9th ed.)349201 Ridley, John, i Dick Pearce. Safety with Machinery. Oxford : Butterworth-Heinemann, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.