Nichols, B. E. (1879). Nichols' practical book-keeping by single and double entry: For the common school, the high school, and the commercial college. Courier steam printing house.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Nichols, Benjamin E. Nichols' Practical Book-keeping by Single and Double Entry: For the Common School, the High School, and the Commercial College. [Ann Arbor, Mich.: Courier steam printing house, 1879.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Nichols, Benjamin E. Nichols' Practical Book-keeping by Single and Double Entry: For the Common School, the High School, and the Commercial College. Courier steam printing house, 1879.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.