Não informado. (2007). Report of the Iowa Agricultural Experiment Station for de two years. Agricultural Experiment Station.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Report of the Iowa Agricultural Experiment Station for De Two Years. Ames, Iowa: Agricultural Experiment Station, 2007.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Report of the Iowa Agricultural Experiment Station for De Two Years. Agricultural Experiment Station, 2007.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.