Gaya APA
Harris, Michael. (2006).
Challenges Students' Book 1 .
:
Pearson Longman.
Gaya Chicago
Harris, Michael.
Challenges Students' Book 1.
:
Pearson Longman,
2006.
Text.
Gaya MLA
Harris, Michael.
Challenges Students' Book 1.
:
Pearson Longman,
2006.
Text.
Gaya Turabian
Harris, Michael.
Challenges Students' Book 1.
:
Pearson Longman,
2006.
Print.