APA-Zitierstil (7. Ausg.)

(2014). That's what makes a hippopotamus smile! (1. publ. in Great Britain and in the USA.). Frances Lincoln Children's Books.

Chicago-Zitierstil (17. Ausg.)

That's What Makes a Hippopotamus Smile! 1. publ. in Great Britain and in the USA. London: Frances Lincoln Children's Books, 2014.

MLA-Zitierstil (9. Ausg.)

That's What Makes a Hippopotamus Smile! 1. publ. in Great Britain and in the USA. Frances Lincoln Children's Books, 2014.