Gaya APA
Biology for OCR 1. (2008).
Cambridge:
Cambridge university.
Gaya Chicago
Biology for OCR 1.
.
Cambridge:
Cambridge university,
2008.
Buku.
Gaya MLA
Biology for OCR 1.
.
Cambridge:
Cambridge university,
2008.
Buku.
Gaya Turabian
Biology for OCR 1.
Cambridge:
Cambridge university,
2008.
Buku.