Gaya APA
PREPARATION FOR THE TOEFL UP 2 B. (2004).
Pekanbaru:
UNRI.
Gaya Chicago
PREPARATION FOR THE TOEFL UP 2 B.
.
Pekanbaru:
UNRI,
2004.
Non Fiksi.
Gaya MLA
PREPARATION FOR THE TOEFL UP 2 B.
.
Pekanbaru:
UNRI,
2004.
Non Fiksi.
Gaya Turabian
PREPARATION FOR THE TOEFL UP 2 B.
Pekanbaru:
UNRI,
2004.
Non Fiksi.