APA (7th ed.) Citation

Kirby, R. K., Kirby, R., & Kelly, D. (2004). Boy trouble. Boy Trouble Books.

Chicago Style (17th ed.) Citation

Kirby, Robert; Kelly, Robert Kirby, and David Kelly. Boy Trouble. Seattle: Boy Trouble Books, 2004.

MLA (8th ed.) Citation

Kirby, Robert; Kelly, et al. Boy Trouble. Boy Trouble Books, 2004.