Gaya APA
Ekologi Environment. (1972).
London:
Educational Publishing.
Gaya Chicago
Ekologi Environment.
.
London:
Educational Publishing,
1972.
Buku.
Gaya MLA
Ekologi Environment.
.
London:
Educational Publishing,
1972.
Buku.
Gaya Turabian
Ekologi Environment.
London:
Educational Publishing,
1972.
Buku.