APA (7th ed.) Citation

Becker, L., Frain, C., Hill, D. A., & Thomas, K. Top grammar plus: Elementary.

Chicago Style (17th ed.) Citation

Becker, Lucy, Carol Frain, David A. Hill, and Karen Thomas. Top Grammar Plus: Elementary. [Rum].

MLA (9th ed.) Citation

Becker, Lucy, et al. Top Grammar Plus: Elementary.