APA (7th ed.) Citation

Harris M. Michael, Mower D. David, & Sikorzynska A. Anna. (2001). Opportunities. Pre-Intermediate: Student's Book (4th ed.). Harlow, Longman, 2001.

Chicago Style (17th ed.) Citation

Harris M. Michael, Mower D. David, and Sikorzynska A. Anna. Opportunities. Pre-Intermediate: Student's Book. 4th ed. Harlow, Longman, 2001, 2001.

MLA (9th ed.) Citation

Harris M. Michael, et al. Opportunities. Pre-Intermediate: Student's Book. 4th ed. Harlow, Longman, 2001, 2001.