APA (7th ed.) Citation

Chase, J. H. (1973). Knock, knock! Who's there? Robert Hale.

Chicago Style (17th ed.) Citation

Chase, James Hadley. Knock, Knock! Who's There? London: Robert Hale, 1973.

MLA (8th ed.) Citation

Chase, James Hadley. Knock, Knock! Who's There? Robert Hale, 1973.

Warning: These citations may not always be 100% accurate.