Παραπομπή APA

Chhatwal G R. (1999). Encyclopaedia of environmental pollution and its control v.1: Air pollution. Anmol.

Παραπομπή Chicago Style

Chhatwal G R. Encyclopaedia of Environmental Pollution and Its Control V.1: Air Pollution. New Delhi: Anmol, 1999.

Παραπομπή MLA

Chhatwal G R. Encyclopaedia of Environmental Pollution and Its Control V.1: Air Pollution. Anmol, 1999.