Rubin, G. (2018). The happiness project: Or, why i spent a year trying to sing in the morning, clean my closets, fight right, read aristotle, and generally have more fun (Tenth Anniversary edition--updated with new material.). Harpercollins.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRubin, Gretchen. The Happiness Project: Or, Why I Spent a Year Trying to Sing in the Morning, Clean My Closets, Fight Right, Read Aristotle, and Generally Have More Fun. Tenth Anniversary edition--updated with new material. New York: Harpercollins, 2018.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRubin, Gretchen. The Happiness Project: Or, Why I Spent a Year Trying to Sing in the Morning, Clean My Closets, Fight Right, Read Aristotle, and Generally Have More Fun. Tenth Anniversary edition--updated with new material. Harpercollins, 2018.