Gaya APA
Biology : Developed spesifically for IB Diploma. (2007).
England:
Pearson.
Gaya Chicago
Biology : Developed spesifically for IB Diploma.
.
England:
Pearson,
2007.
Buku.
Gaya MLA
Biology : Developed spesifically for IB Diploma.
.
England:
Pearson,
2007.
Buku.
Gaya Turabian
Biology : Developed spesifically for IB Diploma.
England:
Pearson,
2007.
Buku.