APA (7th ed.) Citation

Blackstone, S., & Mockford, C. (2003). Cleo's counting book. Barefoot Books.

Chicago Style (17th ed.) Citation

Blackstone, Stella, and Caroline Mockford. Cleo's Counting Book. Bath: Barefoot Books, 2003.

MLA (9th ed.) Citation

Blackstone, Stella, and Caroline Mockford. Cleo's Counting Book. Barefoot Books, 2003.