Gaya APA
American Education. (2008).
Boston:
Mc Graw Hill.
Gaya Chicago
American Education.
13th.
Boston:
Mc Graw Hill,
2008.
Buku.
Gaya MLA
American Education.
13th.
Boston:
Mc Graw Hill,
2008.
Buku.
Gaya Turabian
American Education.
Boston:
Mc Graw Hill,
2008.
Buku.