APA Style

Stilton, G., Tomasutti, E. (2008). Geronimo Stilton i'm not a supermouse! . New York, USA: Scholastic Inc.

MLA Style

Stilton, Geronimo., Tomasutti, Elena. "Geronimo Stilton i'm not a supermouse!". New York, USA: Scholastic Inc, 2008. Text.