ebrary, Inc. (2000). Safe work in the 21st century: Education and training needs for the next decade's occupational safety and health personnel. National Academy Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)ebrary, Inc. Safe Work in the 21st Century: Education and Training Needs for the Next Decade's Occupational Safety and Health Personnel. Washington, DC: National Academy Press, 2000.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)ebrary, Inc. Safe Work in the 21st Century: Education and Training Needs for the Next Decade's Occupational Safety and Health Personnel. National Academy Press, 2000.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.