Schroff, L., & Ward, P. (2019). An invisible thread: The true story of an 11-year-old panhandler, a busy sales executive, and an unlikely meeting with destiny (Unabridged.). Simon & Schuster Audio.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Schroff, Laura, و Pam Ward. An Invisible Thread: The True Story of an 11-year-old Panhandler, a Busy Sales Executive, and an Unlikely Meeting with Destiny. Unabridged. New York: Simon & Schuster Audio, 2019.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Schroff, Laura, و Pam Ward. An Invisible Thread: The True Story of an 11-year-old Panhandler, a Busy Sales Executive, and an Unlikely Meeting with Destiny. Unabridged. Simon & Schuster Audio, 2019.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.