Pacific Northwest Library Association. Reference Section, Todd, R., & Gilbert, E. S. (1930). Nineteenth century American publishers. Reference Section of the Pacific Northwest Library Association.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Pacific Northwest Library Association. Reference Section, Ronald Todd, و Elizabeth Showacre Gilbert. Nineteenth Century American Publishers. [Seattle?: Reference Section of the Pacific Northwest Library Association, 1930.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Pacific Northwest Library Association. Reference Section, et al. Nineteenth Century American Publishers. Reference Section of the Pacific Northwest Library Association, 1930.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.