Gaya APA
WHO, Geneva. (1987).
Air quality guidelines for europe .
Malang Kota:
WHO, Geneva.
Gaya Chicago
WHO, Geneva.
Air quality guidelines for europe.
Malang Kota:
WHO, Geneva,
1987.
Text.
Gaya MLA
WHO, Geneva.
Air quality guidelines for europe.
Malang Kota:
WHO, Geneva,
1987.
Text.
Gaya Turabian
WHO, Geneva.
Air quality guidelines for europe.
Malang Kota:
WHO, Geneva,
1987.
Print.