Cita APA (7th ed.)

Hughes, P., & Ferrett, E. (2010). Introduction to international health and safety at work: The handbook for the NEBOSH international general certificate. Butterworth-Heinemann.

Cita Chicago (17th ed.)

Hughes, Phil, i Ed Ferrett. Introduction to International Health and Safety at Work: The Handbook for the NEBOSH International General Certificate. Oxford, UK: Butterworth-Heinemann, 2010.

Cita MLA (9th ed.)

Hughes, Phil, i Ed Ferrett. Introduction to International Health and Safety at Work: The Handbook for the NEBOSH International General Certificate. Butterworth-Heinemann, 2010.