APA استشهاد

Chitkara,M.G. (1997). Encyclopaedia of ecology, environment and pollution: Vol. 4 -Population, poverty and environment. APH Publishing.

استشهاد بنمط شيكاغو

Chitkara,M.G. Encyclopaedia of Ecology, Environment and Pollution: Vol. 4 -Population, Poverty and Environment. New Delhi: APH Publishing, 1997.

MLA استشهاد

Chitkara,M.G. Encyclopaedia of Ecology, Environment and Pollution: Vol. 4 -Population, Poverty and Environment. APH Publishing, 1997.