References

 

Aplin,et. al., (1995),Global Environmental Crises: An Australian Perspective, Oxford University Press.

Cunningham WP & Saigo BW (1992), Environmental Science: A Global Concern, Second Edition. Wm.C. Brown Publishers, IA., USA.

Primack, R.B., (1993), Essentials of Conservation Biology,Sinauer Associates inc. Publishing, Mass., USA.

White, I.D., Mottershead, D.N., & Harrison, S.J., (1992), Environmental Systems: An Introductory Text, second edition, Chapman & Hall, London.