Citazione Stile APA (7a Edizione)

Harris, M., Elsworth, S., rose, J., & Mower, D. (2001). Opportunities, 3er Año de Enseñanza Media: Student's book. Antártica Quebecor.

Citazione stile Chigago Style (17a edizione)

Harris, Michael, Steve Elsworth, Jim rose, e David Mower. Opportunities, 3er Año De Enseñanza Media: Student's Book. Santiago: Antártica Quebecor, 2001.

Citatione MLA (9a ed.)

Harris, Michael, et al. Opportunities, 3er Año De Enseñanza Media: Student's Book. Antártica Quebecor, 2001.