Richards, E. P. (2002). The role of medical and public health services in sustainable development. Environmental Law Institute.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Richards, Edward P. The Role of Medical and Public Health Services in Sustainable Development. Washington, D.C.: Environmental Law Institute, 2002.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Richards, Edward P. The Role of Medical and Public Health Services in Sustainable Development. Environmental Law Institute, 2002.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.