APA (7th ed.) Citation

Tolkien, J. R. R., Scull, C., & Hammond, W. G. (2002). Roverandom. HarperCollins.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., Christina Scull, and Wayne G. Hammond. Roverandom. London: HarperCollins, 2002.

MLA (8th ed.) Citation

Tolkien, J. R. R., et al. Roverandom. HarperCollins, 2002.