Gaya APA
Environmental Science. (1984).
New York:
CBS College publishing.
Gaya Chicago
Environmental Science.
Ed.3.
New York:
CBS College publishing,
1984.
.
Gaya MLA
Environmental Science.
Ed.3.
New York:
CBS College publishing,
1984.
.
Gaya Turabian
Environmental Science.
New York:
CBS College publishing,
1984.
.