APA (7th ed.) Citation

Root, Ruffle, Snape, & Langley. (2012). My first dictionary (Rev. ed.). Dorling Kindersley.

Chicago Style (17th ed.) Citation

Root, Ruffle, Snape, and Langley. My First Dictionary. Rev. ed. London: Dorling Kindersley, 2012.

MLA (8th ed.) Citation

Root, et al. My First Dictionary. Rev. ed. Dorling Kindersley, 2012.