1. Aber, J. D., Botkin, D. B. & Melillo, J. M. 1979. Predicting the effects of different harvesting regimes on productivity and yield in northern hardwoods. Can. J. For. Res. 9: 10–14.
2. Aber, J. D., Melillo, J. M. & Federer, C. A. 1982. Predicting the effects of rotation length, harvest intensity, and fertilization on fiber yield from northern hardwood forests in New England. For. Sci. 28: 31–45.
3. Acocks, J. P. H. 1975. Veld types of South Africa. Mem. of the Bot. Surv. S. Africa. 40. Govt. Printer, Pretoria.
4. Auclair, A. N. & Goff, F. G. 1971. Diversity relations in the upland forests of the western Great Lakes area. Am. Nat. 105: 499–528.
5. Aung, L. H. 1974. Root-shoot relationships. In: Carson E. W. (ed.), The plant root and its environment, pp. 29–61. University Press, Virginia.