APA (7th ed.) Citation

Sachar, L. (1987). There's a boy in the girls' bathroom. Knopf.

Chicago Style (17th ed.) Citation

Sachar, Louis. There's a Boy in the Girls' Bathroom. New York: Knopf, 1987.

MLA (9th ed.) Citation

Sachar, Louis. There's a Boy in the Girls' Bathroom. Knopf, 1987.