APA
Swarup R, . (1992). Encyclopaedia of Ecology Environment and Pollution Control. New Delhi: Mittal Publication.
Chicago
Swarup R, . 1992. Encyclopaedia of Ecology Environment and Pollution Control. New Delhi: Mittal Publication.
Harvard
Swarup R, . (1992). Encyclopaedia of Ecology Environment and Pollution Control. New Delhi: Mittal Publication.
MLA
Swarup R, . Encyclopaedia of Ecology Environment and Pollution Control. New Delhi: Mittal Publication. 1992.