APA (7th ed.) Citation

Nilsson, U., Spee, G., & Marshall, J. (2015). The first case (English language edition.). Gecko Press USA.

Chicago Style (17th ed.) Citation

Nilsson, Ulf, Gitte Spee, and Julia Marshall. The First Case. English language edition. [United States?]: Gecko Press USA, 2015.

MLA (9th ed.) Citation

Nilsson, Ulf, et al. The First Case. English language edition. Gecko Press USA, 2015.