APA (7th ed.) Citation

Chamot, A. U., De Mado, J., & Hollie, S. (2008). Longman Keystone B: Teacher's Edition. Longman.

Chicago Style (17th ed.) Citation

Chamot, Anna Uhl, John De Mado, and Sharroky Hollie. Longman Keystone B: Teacher's Edition. London: Longman, 2008.

MLA (9th ed.) Citation

Chamot, Anna Uhl, et al. Longman Keystone B: Teacher's Edition. Longman, 2008.