Shifrin, M. (2018). 30 before 30: How I made a mess of my 20s, and you can too (First edition.). Wednesday Books.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Shifrin, Marina. 30 Before 30: How I Made a Mess of My 20s, and You Can Too. First edition. New York: Wednesday Books, 2018.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Shifrin, Marina. 30 Before 30: How I Made a Mess of My 20s, and You Can Too. First edition. Wednesday Books, 2018.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.