World Health Organization & Cassel, J. (1970). The Education and training of engineers for environmental health. World Health Organization.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)World Health Organization و John Cassel. The Education and Training of Engineers for Environmental Health. Geneva: World Health Organization, 1970.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)World Health Organization و John Cassel. The Education and Training of Engineers for Environmental Health. World Health Organization, 1970.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.