Kinney, J. (2010). Dairy of a Wimpy Kid: The Ugly truth. Penguin Books.
Cita Chicago (17th ed.)Kinney, Jeff. Dairy of a Wimpy Kid: The Ugly Truth. London: Penguin Books, 2010.
Cita MLA (9th ed.)Kinney, Jeff. Dairy of a Wimpy Kid: The Ugly Truth. Penguin Books, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.