Gaya APA
GLOBAL ENVIRONMENT QUTLOOK. (1999).
LONDON:
UNEP.
Gaya Chicago
GLOBAL ENVIRONMENT QUTLOOK.
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LONDON:
UNEP,
1999.
Text.
Gaya MLA
GLOBAL ENVIRONMENT QUTLOOK.
.
LONDON:
UNEP,
1999.
Text.
Gaya Turabian
GLOBAL ENVIRONMENT QUTLOOK.
LONDON:
UNEP,
1999.
Print.