Gaya APA
Biology for IB Diploma. (2011).
Cambridge:
Cambridge university.
Gaya Chicago
Biology for IB Diploma.
.
Cambridge:
Cambridge university,
2011.
Buku.
Gaya MLA
Biology for IB Diploma.
.
Cambridge:
Cambridge university,
2011.
Buku.
Gaya Turabian
Biology for IB Diploma.
Cambridge:
Cambridge university,
2011.
Buku.