APA (7th ed.) Citation

Ada, A. F., Escrivá, V., & Randall, B. (1999). How happy I would be. Santillana.

Chicago Style (17th ed.) Citation

Ada, Alma Flor, Viví Escrivá, and Bernice Randall. How Happy I Would Be. Miami, FL: Santillana, 1999.

MLA (9th ed.) Citation

Ada, Alma Flor, et al. How Happy I Would Be. Santillana, 1999.