Gaya APA
Environmental pollution: water. (1992).
New Delhi:
Venus Publishing House.
Gaya Chicago
Environmental pollution: water.
.
New Delhi:
Venus Publishing House,
1992.
Tesis.
Gaya MLA
Environmental pollution: water.
.
New Delhi:
Venus Publishing House,
1992.
Tesis.
Gaya Turabian
Environmental pollution: water.
New Delhi:
Venus Publishing House,
1992.
Tesis.