Gaya APA
New Opportunities Education for Life: Upper Intermediate Students' Book. (2006).
Harlow:
Pearson education.
Gaya Chicago
New Opportunities Education for Life: Upper Intermediate Students' Book.
Cet. 2.
Harlow:
Pearson education,
2006.
.
Gaya MLA
New Opportunities Education for Life: Upper Intermediate Students' Book.
Cet. 2.
Harlow:
Pearson education,
2006.
.
Gaya Turabian
New Opportunities Education for Life: Upper Intermediate Students' Book.
Harlow:
Pearson education,
2006.
.