APA (7th ed.) Citation

Heller, R. (2015). Behind the mask: A book about prepositions. Puffin Books.

Chicago Style (17th ed.) Citation

Heller, Ruth. Behind the Mask: A Book About Prepositions. New York: Puffin Books, 2015.

MLA (9th ed.) Citation

Heller, Ruth. Behind the Mask: A Book About Prepositions. Puffin Books, 2015.

Warning: These citations may not always be 100% accurate.