APA (7th ed.) Citation

Graves, S., & Guicciardini, D. (2014). I'm not happy: A book about feeling sad. Franklin Watts.

Chicago Style (17th ed.) Citation

Graves, Sue, and Desideria Guicciardini. I'm Not Happy: A Book About Feeling Sad. London: Franklin Watts, 2014.

MLA (8th ed.) Citation

Graves, Sue, and Desideria Guicciardini. I'm Not Happy: A Book About Feeling Sad. Franklin Watts, 2014.