APA (7th ed.) Citation

Gibson, R., Abel, S., Su, L., & Blundell, K. (1993). You and your child number games. Usborne.

Chicago Style (17th ed.) Citation

Gibson, Ray, Simone Abel, Lucy Su, and Kim Blundell. You and Your Child Number Games. London: Usborne, 1993.

MLA (9th ed.) Citation

Gibson, Ray, et al. You and Your Child Number Games. Usborne, 1993.