Marshall, T. (2018). The age of walls: How barriers between nations are changing our world (First Scribner hardcover edition.). Scribner.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Marshall, Tim. The Age of Walls: How Barriers Between Nations Are Changing Our World. First Scribner hardcover edition. New York: Scribner, 2018.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Marshall, Tim. The Age of Walls: How Barriers Between Nations Are Changing Our World. First Scribner hardcover edition. Scribner, 2018.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.