Rubin, G. (2017). The four tendencies: The indispensable personality profiles that reveal how to make your life better (and other people's lives better, too).
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Rubin, Gretchen. The Four Tendencies: The Indispensable Personality Profiles That Reveal How to Make Your Life Better (and Other People's Lives Better, Too). 2017.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Rubin, Gretchen. The Four Tendencies: The Indispensable Personality Profiles That Reveal How to Make Your Life Better (and Other People's Lives Better, Too). 2017.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.