Gaya APA

Hughes, P., Ferrett, E. (2011). Introduction to Health and Safety at Work : The Handbook for the NEBOSH National General Certificate (Ed. 5). United Kingdom: Penerbit Butterworth-Heinemann An imprint of Elsevier.

Gaya MLA

Hughes, Phil., Ferrett, Ed. "Introduction to Health and Safety at Work : The Handbook for the NEBOSH National General Certificate". Ed. 5 United Kingdom: Penerbit Butterworth-Heinemann An imprint of Elsevier, 2011. Text.