Não informado. (1976). Illinois Natural History Survey Special Publications. Department of Energy and Natural Resources, Natural History Division.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Illinois Natural History Survey Special Publications. Champaign, Ill: Department of Energy and Natural Resources, Natural History Division, 1976.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Illinois Natural History Survey Special Publications. Department of Energy and Natural Resources, Natural History Division, 1976.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.