APA (7th ed.) Citation

Winthrop, E. (1978). Knock, knock, who's there? Holiday House.

Chicago Style (17th ed.) Citation

Winthrop, Elizabeth. Knock, Knock, Who's There? New York: Holiday House, 1978.

MLA (9th ed.) Citation

Winthrop, Elizabeth. Knock, Knock, Who's There? Holiday House, 1978.