Schroff, L. (2011). An invisible thread: The true story of an 11-year-old panhandler, a busy sales executive, and an unlikely meeting with destiny.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Schroff, Laura. An Invisible Thread: The True Story of an 11-year-old Panhandler, a Busy Sales Executive, and an Unlikely Meeting with Destiny. 2011.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Schroff, Laura. An Invisible Thread: The True Story of an 11-year-old Panhandler, a Busy Sales Executive, and an Unlikely Meeting with Destiny. 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.