1. Phytosocio logical observations on weeds along footh paths in the University of Ibadan campus, Nigeria;Adeoye E. O. A.;Nigerian Field (U.K.),1981
2. Chapman S. B. 1976 Methods in Plant Ecology.536pp. London.
3. Clements F. E.;Weaver J. E.Hanson H. C. 1929 Plant competition – an analysis of community function. Carnegie Inst. Publ. No. 398 340pp.
4. Curtis J.‐T. 1959 The vegetation of Wisconsin. An ordination of plant communities.657pp. Madison.
5. Daubenmire R. F. 1974 Plants and Environment. A textbook of plant autecology.422pp. New Delhi.