Schade, L., & Helper, H. R. (1860). A book for the "impending crisis"!: Appeal to the common sense and patriotism of the people of the United States. "Helperism" annihilated! The "irrepressible conflict" and its consequences! Little, Morris.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Schade, Louis, و Hinton Rowan Helper. A Book for the "Impending Crisis"!: Appeal to the Common Sense and Patriotism of the People of the United States. "Helperism" Annihilated! The "Irrepressible Conflict" and Its Consequences! Washington, D.C.: Little, Morris, 1860.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Schade, Louis, و Hinton Rowan Helper. A Book for the "Impending Crisis"!: Appeal to the Common Sense and Patriotism of the People of the United States. "Helperism" Annihilated! The "Irrepressible Conflict" and Its Consequences! Little, Morris, 1860.