APA (7th ed.) Zitazioa

Harris, M., Mower, D., & Sikorzynska, A. (2006). New Opportunities, Education for life: Pre-intermediate. Students' Book (2a. ed.). Pearson Education Limited.

Chicago Style (17th ed.) Zitazioa

Harris, Michael, David Mower, eta Anna Sikorzynska. New Opportunities, Education for Life: Pre-intermediate. Students' Book. 2a. ed. Essex: Pearson Education Limited, 2006.

MLA (9th ed.) Zitazioa

Harris, Michael, et al. New Opportunities, Education for Life: Pre-intermediate. Students' Book. 2a. ed. Pearson Education Limited, 2006.