Kinney, J. (2013). Diary of a wimpy kid: Hard luck. Amulet Books.
Cita Chicago (17th ed.)Kinney, Jeff. Diary of a Wimpy Kid: Hard Luck. New York: Amulet Books, 2013.
Cita MLA (9th ed.)Kinney, Jeff. Diary of a Wimpy Kid: Hard Luck. Amulet Books, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.