APA (7th ed.) Citation

Ekeland, I. (2006). The cat in numberland (1. ed.). Cricket Books.

Chicago Style (17th ed.) Citation

Ekeland, Ivar. The Cat in Numberland. 1. ed. Chicago: Cricket Books, 2006.

MLA (9th ed.) Citation

Ekeland, Ivar. The Cat in Numberland. 1. ed. Cricket Books, 2006.