APA (7th ed.) Citation

Willems,Mo. (2012). My friend is sad. Walkers Books Ltd.

Chicago Style (17th ed.) Citation

Willems,Mo. My Friend Is Sad. London: Walkers Books Ltd, 2012.

MLA (9th ed.) Citation

Willems,Mo. My Friend Is Sad. Walkers Books Ltd, 2012.

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