APA (7th ed.) Citation

Kinney, J. (2007). Greg Heffley's journal. Puffin Books.

Chicago Style (17th ed.) Citation

Kinney, Jeff. Greg Heffley's Journal. London: Puffin Books, 2007.

MLA (9th ed.) Citation

Kinney, Jeff. Greg Heffley's Journal. Puffin Books, 2007.

Warning: These citations may not always be 100% accurate.