Não informado. (1952). Forestry Research Notes. University of Wisconsin, College of Agricultural and Life Sciences, Extension Forestry Office.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Forestry Research Notes. Madison, Wis: University of Wisconsin, College of Agricultural and Life Sciences, Extension Forestry Office, 1952.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Forestry Research Notes. University of Wisconsin, College of Agricultural and Life Sciences, Extension Forestry Office, 1952.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.