Gaya APA
Field, Barry C, Martha K Field. (2017).
Environmental Economics An Introduction (7th ed.).
United states:
McGraw-Hill.
Gaya Chicago
Field, Barry C, Martha K Field.
Environmental Economics An Introduction.
7th ed.
United states:
McGraw-Hill,
2017.
Text.
Gaya MLA
Field, Barry C, Martha K Field.
Environmental Economics An Introduction.
7th ed.
United states:
McGraw-Hill,
2017.
Text.
Gaya Turabian
Field, Barry C, Martha K Field.
Environmental Economics An Introduction.
7th ed.
United states:
McGraw-Hill,
2017.
Print.