Kinney, J. (2015). Dairy of a wimpy kid: Hard Luck. Penguin Books.
Dyfyniad Arddull ChicagoKinney, Jeff. Dairy of a Wimpy Kid: Hard Luck. London: Penguin Books, 2015.
Dyfyniad MLAKinney, Jeff. Dairy of a Wimpy Kid: Hard Luck. Penguin Books, 2015.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.