Gaya APA
Biologi. (1978).
Philippine:
Addison Wesley publishing.
Gaya Chicago
Biologi.
.
Philippine:
Addison Wesley publishing,
1978.
Buku.
Gaya MLA
Biologi.
.
Philippine:
Addison Wesley publishing,
1978.
Buku.
Gaya Turabian
Biologi.
Philippine:
Addison Wesley publishing,
1978.
Buku.