APA (7th ed.) Citation

Harris M. Michael, Mower D. David, & Sikorzynska A. Anna. (2002). Opportunities. Upper Intermediate. Harlow, Longman, 2002.

Chicago Style (17th ed.) Citation

Harris M. Michael, Mower D. David, and Sikorzynska A. Anna. Opportunities. Upper Intermediate. Harlow, Longman, 2002, 2002.

MLA (9th ed.) Citation

Harris M. Michael, et al. Opportunities. Upper Intermediate. Harlow, Longman, 2002, 2002.