Gaya APA
New Longman Science 4. (2007).
:
Pearson Longman.
Gaya Chicago
New Longman Science 4.
.
:
Pearson Longman,
2007.
Text.
Gaya MLA
New Longman Science 4.
.
:
Pearson Longman,
2007.
Text.
Gaya Turabian
New Longman Science 4.
:
Pearson Longman,
2007.
Print.