Gaya APA
Environmental Economics: an Introduction. (2006).
New York:
McGraw-Hill.
Gaya Chicago
Environmental Economics: an Introduction.
Ed.4.
New York:
McGraw-Hill,
2006.
.
Gaya MLA
Environmental Economics: an Introduction.
Ed.4.
New York:
McGraw-Hill,
2006.
.
Gaya Turabian
Environmental Economics: an Introduction.
New York:
McGraw-Hill,
2006.
.