Gaya APA
ENVIRONMENTAL GOOD PRACTICE IN HOTELS. (1991).
FRANCE:
UNEP.
Gaya Chicago
ENVIRONMENTAL GOOD PRACTICE IN HOTELS.
.
FRANCE:
UNEP,
1991.
Text.
Gaya MLA
ENVIRONMENTAL GOOD PRACTICE IN HOTELS.
.
FRANCE:
UNEP,
1991.
Text.
Gaya Turabian
ENVIRONMENTAL GOOD PRACTICE IN HOTELS.
FRANCE:
UNEP,
1991.
Print.