APA

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. New York: Harper.

Chicago

Rubin Gretchen, . 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. New York: Harper.

Harvard

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. New York: Harper.

MLA

Rubin 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. New York: Harper. 2018.