Παραπομπή APA

Ridley, J. (2002). Safety with machinery. Butterworth- Heinemann.

Παραπομπή Chicago Style

Ridley, John. Safety with Machinery. Oxford: Butterworth- Heinemann, 2002.

Παραπομπή MLA

Ridley, John. Safety with Machinery. Butterworth- Heinemann, 2002.