Gaya APA

powerbook, N, O, E, F, L, P, L. (2006). New opportunities education for life: pre-intermediate language powerbook . Singapore: Pearson Longman.

Gaya MLA

powerbook, New, Opportunities, Education, For, Life:, Pre-intermediate, Language. "New opportunities education for life: pre-intermediate language powerbook". Singapore: Pearson Longman, 2006. Text.