Gaya APA
Biology Life On Earth. (1993).
USA:
Pearson Prentice Hall.
Gaya Chicago
Biology Life On Earth.
.
USA:
Pearson Prentice Hall,
1993.
Buku.
Gaya MLA
Biology Life On Earth.
.
USA:
Pearson Prentice Hall,
1993.
Buku.
Gaya Turabian
Biology Life On Earth.
USA:
Pearson Prentice Hall,
1993.
Buku.