Gaya APA
Longman: Advanced American Dictionary. (2008).
Inggris:
Pearson Education Inc.
Gaya Chicago
Longman: Advanced American Dictionary.
Ed.2.
Inggris:
Pearson Education Inc,
2008.
Textbook.
Gaya MLA
Longman: Advanced American Dictionary.
Ed.2.
Inggris:
Pearson Education Inc,
2008.
Textbook.
Gaya Turabian
Longman: Advanced American Dictionary.
Inggris:
Pearson Education Inc,
2008.
Textbook.