Gaya APA
Field, Barry C.. (2001).
Natural resource economics: an introduction .
Boston:
McGraw Hill.
Gaya Chicago
Field, Barry C..
Natural resource economics: an introduction.
Boston:
McGraw Hill,
2001.
Text.
Gaya MLA
Field, Barry C..
Natural resource economics: an introduction.
Boston:
McGraw Hill,
2001.
Text.
Gaya Turabian
Field, Barry C..
Natural resource economics: an introduction.
Boston:
McGraw Hill,
2001.
Print.