Gaya APA
The living world. (2003).
Boston:
Mc Graw-Hill.
Gaya Chicago
The living world.
3rd.
Boston:
Mc Graw-Hill,
2003.
Buku.
Gaya MLA
The living world.
3rd.
Boston:
Mc Graw-Hill,
2003.
Buku.
Gaya Turabian
The living world.
Boston:
Mc Graw-Hill,
2003.
Buku.