Gaya APA
Basic Ecology. (1971).
New York:
West Washington Square.
Gaya Chicago
Basic Ecology.
.
New York:
West Washington Square,
1971.
Buku.
Gaya MLA
Basic Ecology.
.
New York:
West Washington Square,
1971.
Buku.
Gaya Turabian
Basic Ecology.
New York:
West Washington Square,
1971.
Buku.