APA (7th ed.) Citation

Hobbs, M., Cleary, M., & Sabbatini, L. (2011). Holly's: New friend. Helbling Languages.

Chicago Style (17th ed.) Citation

Hobbs, Martyn, Maria Cleary, and Lorenzo Sabbatini. Holly's: New Friend. Londres: Helbling Languages, 2011.

MLA (9th ed.) Citation

Hobbs, Martyn, et al. Holly's: New Friend. Helbling Languages, 2011.