APA (7th ed.) Citation

Harris, M., & Mower, D. S. (2000). Opportunities: Pre-intermediate : student's book.

Chicago Style (17th ed.) Citation

Harris, Michael, and David Sikorzynska Mower. Opportunities: Pre-intermediate : Student's Book. Harlow, 2000.

MLA (9th ed.) Citation

Harris, Michael, and David Sikorzynska Mower. Opportunities: Pre-intermediate : Student's Book. 2000.