1. Akkermans, A. D. L. , and C. van Dijk. 1981. Non-leguminous root-nodule symbioses with actinomycetes and Rhizobium. In W. J. Broughton (ed.), Nitrogen fixation, Vol. 1. Ecology, pp. 57–103. Clarendon Press, Oxford.
2. Allen, M. F. 1991. The ecology of mycorrhizae. Cambridge University Press, Cambridge.
3. Bacon, C. W. , and N. S. Hill. 1997. Neotyphodium/grass interactions. Plenum Press, New York.
4. Ball, D. M. , J. F. Pedersen, and G. D. Lacefield. 1993. The tall-fescue endophyte. Am. Sci, 81 370-379.
5. Interactions between Herbivores and Endophyte-Infected Festuca rubra from the Scottish Islands of St. Kilda, Benbecula and Rum