Gaya APA
Guidelines for Drinking-water Quality. (2004).
:
World Health Organization.
Gaya Chicago
Guidelines for Drinking-water Quality.
.
:
World Health Organization,
2004.
Text.
Gaya MLA
Guidelines for Drinking-water Quality.
.
:
World Health Organization,
2004.
Text.
Gaya Turabian
Guidelines for Drinking-water Quality.
:
World Health Organization,
2004.
Print.