APA (7th ed.) Citation

Schade, S., & Buller, J. (1991). Hello! Hello!: A counting book. Simon and Schuster Books for Young Readers.

Chicago Style (17th ed.) Citation

Schade, Susan, and Jon Buller. Hello! Hello!: A Counting Book. New York, London, Toronto u.a: Simon and Schuster Books for Young Readers, 1991.

MLA (9th ed.) Citation

Schade, Susan, and Jon Buller. Hello! Hello!: A Counting Book. Simon and Schuster Books for Young Readers, 1991.