APA (7th ed.) Citation

Holt, J. (2013). Why does the world exist?: One man's quest for the big answer (Pbk. ed.). Profile.

Chicago Style (17th ed.) Citation

Holt, Jim. Why Does the World Exist?: One Man's Quest for the Big Answer. Pbk. ed. London: Profile, 2013.

MLA (9th ed.) Citation

Holt, Jim. Why Does the World Exist?: One Man's Quest for the Big Answer. Pbk. ed. Profile, 2013.