References

References
DORST, J. 1970. Before nature dies. Houghton Mifflin Co., Boston.
Dorst
Before nature dies
1970
ELTON, C. S. 1958. The ecology of invasions by animals and plants. Methuen & Co., London.
Elton
The ecology of invasions by animals and plants
1958
LAYCOCK, G. 1966. The alien animals. Ballantine Books, New York.
Laycock
The alien animals
1966
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