Oster, E. (2021). The family firm: A data-driven guide to better decision making in the early school years (Unabridged.). Penguin Audio.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Oster, Emily. The Family Firm: A Data-driven Guide to Better Decision Making in the Early School Years. Unabridged. New York: Penguin Audio, 2021.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Oster, Emily. The Family Firm: A Data-driven Guide to Better Decision Making in the Early School Years. Unabridged. Penguin Audio, 2021.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.