United States. Department of the Interior & Simpson, J. H. (1866). Report of the Secretary of the Interior: Report of James H. Simpson on the Union Pacific railroad .. Gov. Print. Off..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. Department of the Interior و J. H. Simpson. Report of the Secretary of the Interior: Report of James H. Simpson on the Union Pacific Railroad .. [Washington: Gov. Print. Off., 1866.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)United States. Department of the Interior و J. H. Simpson. Report of the Secretary of the Interior: Report of James H. Simpson on the Union Pacific Railroad .. Gov. Print. Off., 1866.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.