Gaya APA
A-Level Biologi. (1989).
New York:
Oxford University Press.
Gaya Chicago
A-Level Biologi.
.
New York:
Oxford University Press,
1989.
Buku.
Gaya MLA
A-Level Biologi.
.
New York:
Oxford University Press,
1989.
Buku.
Gaya Turabian
A-Level Biologi.
New York:
Oxford University Press,
1989.
Buku.