APA (7th ed.) Citation

Gleitzman,Morris. (2005). Once. Puffin books.

Chicago Style (17th ed.) Citation

Gleitzman,Morris. Once. England: Puffin books, 2005.

MLA (9th ed.) Citation

Gleitzman,Morris. Once. Puffin books, 2005.

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