APA (7th ed.) Citation

Erró, Heil, A., & Martial, J. (2018). Erró - Grimaces. Ernest Rathenau Verlag.

Chicago Style (17th ed.) Citation

Erró, Axel Heil, and Julien Martial. Erró - Grimaces. Karlsruhe: Ernest Rathenau Verlag, 2018.

MLA (9th ed.) Citation

Erró, et al. Erró - Grimaces. Ernest Rathenau Verlag, 2018.