Gaya APA
Beaumont, John. (2006).
North Star: Building Skills for The TOEFL iBT, Intermediate .
New York:
Longman.
Gaya Chicago
Beaumont, John.
North Star: Building Skills for The TOEFL iBT, Intermediate .
New York:
Longman,
2006.
BI CORNER.
Gaya MLA
Beaumont, John.
North Star: Building Skills for The TOEFL iBT, Intermediate .
New York:
Longman,
2006.
BI CORNER.
Gaya Turabian
Beaumont, John.
North Star: Building Skills for The TOEFL iBT, Intermediate .
New York:
Longman,
2006.
BI CORNER.