APA Citation

Yrsa Sigurdardottir, & Roughton, P. (2011). The Day is Dark. London: Hodder & Stoughton.

Chicago Style Citation

Yrsa Sigurdardottir, and Philip Roughton. The Day Is Dark. London: Hodder & Stoughton, 2011.

MLA Citation

Yrsa Sigurdardottir, and Philip Roughton. The Day Is Dark. London: Hodder & Stoughton, 2011.

Warning: These citations may not always be 100% accurate.