APA Style

Stilton, G. (2017). A Mammoth Mystery (Geronimo Stilton Cavemice (Book 15)). New York, United States: Scholastic Inc..

MLA Style

Stilton, Geronimo. "A Mammoth Mystery". Geronimo Stilton Cavemice (Book 15) New York, United States: Scholastic Inc., 2017. Text.