Dale Carnegie and Associates, I., & Petkoff, R. (2014). How to win friends & influence people in the digital age (Unabridged.). Recorded Books, Inc..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Dale Carnegie and Associates, Inc, و Robert Petkoff. How to Win Friends & Influence People in the Digital Age. Unabridged. Prince Frederick: Recorded Books, Inc., 2014.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Dale Carnegie and Associates, Inc, و Robert Petkoff. How to Win Friends & Influence People in the Digital Age. Unabridged. Recorded Books, Inc., 2014.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.