Não informado. (1970). Environmental quality. Council on Environmental Quality, Executive Office of the President.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Environmental Quality. Washington: Council on Environmental Quality, Executive Office of the President, 1970.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Environmental Quality. Council on Environmental Quality, Executive Office of the President, 1970.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.