APA (7th ed.) Citation

Baldur Einarsson & Blær Hinriksson. (2017). Heartstone =: Hjartasteinn. Breaking Glass Pictures.

Chicago Style (17th ed.) Citation

Baldur Einarsson and Blær Hinriksson. Heartstone =: Hjartasteinn. [San Francisco, California, USA]: Breaking Glass Pictures, 2017.

MLA (9th ed.) Citation

Baldur Einarsson and Blær Hinriksson. Heartstone =: Hjartasteinn. Breaking Glass Pictures, 2017.