APA (7th ed.) Citation

Sugita, Y. (1973). Helena the unhappy hippopotamus. McGraw-Hill.

Chicago Style (17th ed.) Citation

Sugita, Yutaka. Helena the Unhappy Hippopotamus. New York: McGraw-Hill, 1973.

MLA (9th ed.) Citation

Sugita, Yutaka. Helena the Unhappy Hippopotamus. McGraw-Hill, 1973.