Ferrett, E. (2022). International health and safety at work revision guide: For the NEBOSH international general certificate in occupational health and safety (Third edition.). Routledge, Taylor & Francis Group.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ferrett, Ed. International Health and Safety at Work Revision Guide: For the NEBOSH International General Certificate in Occupational Health and Safety. Third edition. London ; New York: Routledge, Taylor & Francis Group, 2022.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Ferrett, Ed. International Health and Safety at Work Revision Guide: For the NEBOSH International General Certificate in Occupational Health and Safety. Third edition. Routledge, Taylor & Francis Group, 2022.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.