Cita APA (7th ed.)

Harris M. Michael, Mower D. David, & Sikorzynska A. Anna. (2006). Opportunities.Upper Intermediate. Teacher`s Book (6th ed.). Harlow, Longman, 2006.

Cita Chicago (17th ed.)

Harris M. Michael, Mower D. David, i Sikorzynska A. Anna. Opportunities.Upper Intermediate. Teacher`s Book. 6th ed. Harlow, Longman, 2006, 2006.

Cita MLA (9th ed.)

Harris M. Michael, et al. Opportunities.Upper Intermediate. Teacher`s Book. 6th ed. Harlow, Longman, 2006, 2006.