APA (7th ed.) Citation

Morpurgo, M., & Sala, F. (2015). My father is a polar bear. Walker Books.

Chicago Style (17th ed.) Citation

Morpurgo, Michael, and Felicita Sala. My Father Is a Polar Bear. London: Walker Books, 2015.

MLA (9th ed.) Citation

Morpurgo, Michael, and Felicita Sala. My Father Is a Polar Bear. Walker Books, 2015.