APA (7th ed.) Citation

Roslund, A., & Wessel, E. C. (2021). Knock knock. G.P. Putnam's Sons.

Chicago Style (17th ed.) Citation

Roslund, Anders, and Elizabeth Clark Wessel. Knock Knock. New York: G.P. Putnam's Sons, 2021.

MLA (8th ed.) Citation

Roslund, Anders, and Elizabeth Clark Wessel. Knock Knock. G.P. Putnam's Sons, 2021.

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