APA Citation

Arnar Gudmundsson, G. (2018). Heartstone: Corazones de piedra. Madrid: Karma Films.

Chicago style citation

Arnar Gudmundsson, Gudmundur. Heartstone: Corazones De Piedra. Madrid: Karma Films, 2018.

MLA citation

Arnar Gudmundsson, Gudmundur. Heartstone: Corazones De Piedra. Madrid: Karma Films, 2018.

Warning: these citations may not always be totally accurate