Gaya APA
Bradfield, Phil. (2002).
Longman gcse biology .
Amerika:
Longman.
Gaya Chicago
Bradfield, Phil.
Longman gcse biology.
Amerika:
Longman,
2002.
.
Gaya MLA
Bradfield, Phil.
Longman gcse biology.
Amerika:
Longman,
2002.
.
Gaya Turabian
Bradfield, Phil.
Longman gcse biology.
Amerika:
Longman,
2002.
.