Gaya APA
Biology for Advanced Level. (1999).
Cheltenham:
Nelson Thornes.
Gaya Chicago
Biology for Advanced Level.
4.
Cheltenham:
Nelson Thornes,
1999.
Buku.
Gaya MLA
Biology for Advanced Level.
4.
Cheltenham:
Nelson Thornes,
1999.
Buku.
Gaya Turabian
Biology for Advanced Level.
Cheltenham:
Nelson Thornes,
1999.
Buku.