Gaya APA
Signature reading level G. (2007).
New York:
Mc Graw-Hill.
Gaya Chicago
Signature reading level G.
.
New York:
Mc Graw-Hill,
2007.
Buku.
Gaya MLA
Signature reading level G.
.
New York:
Mc Graw-Hill,
2007.
Buku.
Gaya Turabian
Signature reading level G.
New York:
Mc Graw-Hill,
2007.
Buku.