APA (7th ed.) Citation

Hort, L., & Ransome, J. (1991). How many stars in the sky? Tambourine Books.

Chicago Style (17th ed.) Citation

Hort, Lenny, and James Ransome. How Many Stars in the Sky? New York: Tambourine Books, 1991.

MLA (9th ed.) Citation

Hort, Lenny, and James Ransome. How Many Stars in the Sky? Tambourine Books, 1991.