Gaya APA
Pearson Longman Keystone. (2013).
USA:
Pearson Education, Inc.
Gaya Chicago
Pearson Longman Keystone.
.
USA:
Pearson Education, Inc,
2013.
.
Gaya MLA
Pearson Longman Keystone.
.
USA:
Pearson Education, Inc,
2013.
.
Gaya Turabian
Pearson Longman Keystone.
USA:
Pearson Education, Inc,
2013.
.