Achor, S. (2013). Before happiness: The 5 hidden keys to achieving success, spreading happiness, and sustaining positive change. Crown Business.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Achor, Shawn. Before Happiness: The 5 Hidden Keys to Achieving Success, Spreading Happiness, and Sustaining Positive Change. New York: Crown Business, 2013.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Achor, Shawn. Before Happiness: The 5 Hidden Keys to Achieving Success, Spreading Happiness, and Sustaining Positive Change. Crown Business, 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.