Rubin, G. (2018). The happiness project, tenth anniversary edition: Or, why i spent a year trying to sing in the morning, clean my closets, fight right, read aristotle, and generally have more fun.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Rubin, Gretchen. The Happiness Project, Tenth Anniversary Edition: Or, Why I Spent a Year Trying to Sing in the Morning, Clean My Closets, Fight Right, Read Aristotle, and Generally Have More Fun. 2018.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Rubin, Gretchen. The Happiness Project, Tenth Anniversary Edition: Or, Why I Spent a Year Trying to Sing in the Morning, Clean My Closets, Fight Right, Read Aristotle, and Generally Have More Fun. 2018.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.