APA (7th ed.) Citation

Hobbs, M., Cleary, M., & Sabbatini, L. (2011). Ricky's: Big idea. Helbling Languages.

Chicago Style (17th ed.) Citation

Hobbs, Martyn, Maria Cleary, and Lorenzo Sabbatini. Ricky's: Big Idea. Londres: Helbling Languages, 2011.

MLA (9th ed.) Citation

Hobbs, Martyn, et al. Ricky's: Big Idea. Helbling Languages, 2011.