APA (7th ed.) Citation

Glaser, L., & Swan, S. (2003). It's summer! Millbrook Press.

Chicago Style (17th ed.) Citation

Glaser, Linda, and Susan Swan. It's Summer! Brookfield Conn: Millbrook Press, 2003.

MLA (9th ed.) Citation

Glaser, Linda, and Susan Swan. It's Summer! Millbrook Press, 2003.