Boltwood, H. L. (1886). A topical outline of general history: Designed as a guide to the general reader and for review work in schools. Scott, Foresman & Co..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Boltwood, Henry L. A Topical Outline of General History: Designed as a Guide to the General Reader and for Review Work in Schools. Chicago: Scott, Foresman & Co., 1886.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Boltwood, Henry L. A Topical Outline of General History: Designed as a Guide to the General Reader and for Review Work in Schools. Scott, Foresman & Co., 1886.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.