APA (7th ed.) Citation

Blos, J. W., & McCully, E. A. (1989). The grandpa days. Simon and Schuster Books for Young Readers.

Chicago Style (17th ed.) Citation

Blos, Joan W., and Emily Arnold McCully. The Grandpa Days. New York: Simon and Schuster Books for Young Readers, 1989.

MLA (9th ed.) Citation

Blos, Joan W., and Emily Arnold McCully. The Grandpa Days. Simon and Schuster Books for Young Readers, 1989.