APA (7th ed.) Citation

Harris, Sikorzynþska, & Mower. (2001). Opportunities: Elementary (3rd impression.). Longman.

Chicago Style (17th ed.) Citation

Harris, Sikorzynþska, and Mower. Opportunities: Elementary. 3rd impression. Harlow: Longman, 2001.

MLA (8th ed.) Citation

Harris, et al. Opportunities: Elementary. 3rd impression. Longman, 2001.