Illinois Institute for Continuing Legal Education. (1983). Environmental law. Illinois Institute for Continuing Legal Education.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Illinois Institute for Continuing Legal Education. Environmental Law. Springfield, Ill.: Illinois Institute for Continuing Legal Education, 1983.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Illinois Institute for Continuing Legal Education. Environmental Law. Illinois Institute for Continuing Legal Education, 1983.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.