Gaya APA
Chiras, D., D. (1991).
Environmental science : action for a sustainable future (3rd ed).
Redwood City, California:
The Benjamin/Cummings.
Gaya MLA
Chiras, D., D..
Environmental science : action for a sustainable future.
3rd ed
Redwood City, California:
The Benjamin/Cummings,
1991.
Text.