Cita APA (7a ed.)

(2015). O's little book of happiness (First edition.). Flatiron Books.

Cita Chicago Style (17a ed.)

O's Little Book of Happiness. First edition. New York: Flatiron Books, 2015.

Cita MLA (8a ed.)

O's Little Book of Happiness. First edition. Flatiron Books, 2015.

Precaución: Estas citas no son 100% exactas.