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) (First edition.). Harmony Books.
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). First edition. New York: Harmony Books, 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). First edition. Harmony Books, 2017.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.