Gaya APA

Sikorynska, A. et al (2011). New Opportunities Education for Life: Upper Intermediate (Languange Powerbook) . Malaysia: Pearson Education Limited.

Gaya MLA

Sikorynska, Anna. et al. "New Opportunities Education for Life: Upper Intermediate (Languange Powerbook)". Malaysia: Pearson Education Limited, 2011. Text.