APA (7th ed.) Citation

Kinney, J. (2007). Diary of a wimpy kid: Greg Heffley's journal. Puffin.

Chicago Style (17th ed.) Citation

Kinney, Jeff. Diary of a Wimpy Kid: Greg Heffley's Journal. London, England: Puffin, 2007.

MLA (9th ed.) Citation

Kinney, Jeff. Diary of a Wimpy Kid: Greg Heffley's Journal. Puffin, 2007.