APA (7th ed.) Citation

Becker, L., Frain, C., Hill, D. A., & Thomas, K. (2013). Top grammar plus: Pre-intermediate. Helbling Languages.

Chicago Style (17th ed.) Citation

Becker, Lucy, Carol Frain, David A. Hill, and Karen Thomas. Top Grammar Plus: Pre-intermediate. [Rum]: Helbling Languages, 2013.

MLA (9th ed.) Citation

Becker, Lucy, et al. Top Grammar Plus: Pre-intermediate. Helbling Languages, 2013.