Kinney, J. (2015). Dairy of a wimpy kid: Hard Luck. Penguin Books.
Chicago-čujuhus (17. p.)Kinney, Jeff. Dairy of a Wimpy Kid: Hard Luck. London: Penguin Books, 2015.
MLA-čujuhus (9. p.)Kinney, Jeff. Dairy of a Wimpy Kid: Hard Luck. Penguin Books, 2015.
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