Putnam, R. D. (2020). Bowling alone: The collapse and revival of American community (Revised and updated, Simon & Schuster trade paperback edition, 20th anniversary edition.). Simon & Schuster Paperbacks.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Putnam, Robert D. Bowling Alone: The Collapse and Revival of American Community. Revised and updated, Simon & Schuster trade paperback edition, 20th anniversary edition. New York: Simon & Schuster Paperbacks, 2020.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Putnam, Robert D. Bowling Alone: The Collapse and Revival of American Community. Revised and updated, Simon & Schuster trade paperback edition, 20th anniversary edition. Simon & Schuster Paperbacks, 2020.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.